{ General Allanite-(Y) Information : Chemical Formula: (Y,Ce,Ca)2(Al,Fe+++)3(SiO4)3(OH) Composition: Molecular Weight = 598.63 gm Calcium 2.01 % Ca 2.81 % CaO Cerium 14.04 % Ce 16.45 % Ce 2 O 3 Yttrium 17.82 % Y 22.63 % Y 2 O 3 Aluminum 10.14 % Al 19.16 % Al 2 O 3 Iron 7.00 % Fe 10.00 % Fe 2 O 3 A Mineral or a Mineral Group? Massive - Granular - Common texture observed in granite and other igneous rock. else (Mason68) OPTIC PROP. var headTags = document.getElementsByTagName("head"); html += printReadyElem.innerHTML; allanite subgroup, distinguished onthebasis oftheir REE content: allanite-(La) andallanite-(Y). Therefore, theMn content inallanite-(Ce) contains petrogenetic information. A - Atoms On/Off General Allanite- (Ce) Information. Biaxial (-), a=1.715-1.791, b=1.718-1.815, g=1.733-1.822, bire=0.0180-0.0310, 2V(Calc)=50-56, 2V(Meas)=40-80. { Metamictization is a natural, gradual process of destruction of the internal crystal structure of a mineral due to radiation present in the mineral or from nearby external radiation. LA-ICP-MS is an efficient technique for dating melt-precipitated allanite (e.g., from igneous or migmatitic rocks). Chemical Formula: Ca (REE,Ca)Al2 (Fe++,Fe+++) (SiO4) (Si2O7)O (OH) var printReadyElem = document.getElementById("printReady"); Disseminated - Occurs in small, distinct particles dispersed in matrix. Large bladed Allanite crystals to 3cm, one freely crystallized in … if (headTags.length > 0) MolView is an intuitive, Open-Source web-application to make science and education more awesome! printWin.print(); Monazite, xenotime, and allanite are REE1-minerals sensu stricto because lanthanides (La…Lu) and yttrium are critical constituents in them. The written condensed formula lists the atoms in the order in which they appear in the molecular structure. printWin.print(); else Keyboard This type of chemical formula is a sort of shorthand notation. printWin.document.close(); if (printReadyElem != null) Learn about how chemical formulae and reaction information can be written using symbol equations with BBC Bitesize GCSE Chemistry. Allanite. Elements may be in any order. Titanite CaTiSiO5 °c 2001 Mineral Data Publishing, version 1.2 Crystal Data: Monoclinic; may be metamict. The generic chemical formula for monazite, (Ce,La,Nd,Th)(PO 4,SiO 4), reveals that cerium, lanthanum, neodymium, and thorium can substitute for one another in the mineral's structure; and, substitution of silica for phosphate also occurs.Monazite is part of several solid-solution series with other minerals. Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. 14681-78-8. Surface chemistry and flotation properties of allanite (La) were determined. Keywords: allanite-(Ce), rare-earth elements, manganese, chemical zoning, coupled substitution, granitic rocks, origin, crystal size,Japan. Although little weighing is involved in most modern chemical analyses (electron microprobe or energy dispersive x-ray spectrometer) weight percentages are reported for historic reasons (chemists performed their analyses using gravimetric techniques). Before we foray into the area of writing a chemical formula, we must acquaint ourselves with the basics of chemical formulae. Español function printSpecial() alert("Could not find the printReady section in the HTML"); Mindat.org's Discussion Groups html += headTags[0].innerHTML; It has the general formula A2M3Si3O12[OH], where the A sites can contain large cations such as Ca , Sr , and rare-earth elements, and the M sites admit Al , Fe , Mn , Fe , or Mg among others. NAME( Duda&Rejl90) PHYS. equate description of the chemical composition of allanite-(Ce), it is not an end-member formula; rather, the formula describes a mixture of many distinct end-members. Name: Allanite-(Ce) RRUFF ID: R080092 Ideal Chemistry: CaCe(Al 2 Fe 2+)[Si 2 O 7][SiO 4]O(OH) Locality: Arendal, Norway Source: University of Arizona Mineral Museum 4499 Owner: RRUFF Description: Dark brown fragment from metamict sample R050043, after heating at T = 1000 C for 18 hours Status: The identification of this mineral is not yet confirmed. Allanite-(Ce) is a rare member of the Epidote Group of minerals that includes Allanite, Clinozoisite, Epidote, Hancockite, Mukhinite, Piedmontite, Tanzanite, Thulite and Zoisite. drag2 - RMB Resize/Rotate Mineral Discussion Forum from Fabre Minerals - also available in I - Data Info It was not until 1991 that Edward S. Grew established dissakisite as the actual Mg dominant allanite mineral with formula Ca(Ce,La)MgAl 2 Si 3 O 12 (OH). drag1 - LMB Manipulate Structure Use correct case for element symbols. Allanite (also called Orthite) Locality: Rode Ranch Pegmatite, Llano County, Texas Allanite is a Sorosilicate, often containing rare earth elements. if (printReadyElem != null) We recommend you use a larger device to draw your structure. THE CHEMICAL AND MINERALOGICAL RESPONSE OF ALLANITE TO HYDROTHERMAL ALTERATION, CASTO GRANITE, IDAHO. It has the general formula A 2 M 3 Si 3 O 12 [OH] where the A sites can contain large cations such as Ca 2+, Sr 2+, and rare earth elements and the M sites admit Al 3+, Fe 3+, Mn 3+, Fe 2+, or Mg 2+ among others [4]. { Allanite grains and later alteration to monazite were identified in polished thin sections using BSE images. Visit our Advertisers for Allanite-(Ce) : Ask about Allanite-(Ce) here : Binary acids consist of two elements. When the electropositive metals on the left combine with the non–metals on the right, quite often ionic bond is formed e.g. { _uacct = "UA-3067463-1"; yellowish brown, reddish brown, brownish green, dark reddish brown, or greenish brown. NAME( Duda&Rejl90) PHYS. Cerium 27.35 % Ce 32.04 % Ce 2 O 3. Chemical Formula Search Help Rules for chemical formulas (Back to search) Enter a sequence of element symbols followed by numbers to specify the amounts of desired elements (e.g., C6H6). Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. Dispersion distinct to strong, r > v. colorless, pale yellow, yellowish brown, pink, or greenish yellow. Orthoenstatite. Regarding your second question, I suggest you load the caption package and employ a suitable value for the labelsep option.. Whatever else you do, though, I strongly recommend you load one of several possible chemical formula packages and use their macros to typeset chemical compounds. Ask-A-Mineralogist from the Mineralogical Society of America Chemical analyses for silicate minerals are commonly reported in weight percentages of the oxides of the elements determined. Scale: Crystal Size 0.8 cm. { Allanite-(Y) is Radioactive as defined in 49 CFR 173.403. Chemical Formulae . Alunite, also called Alum Stone, a widespread rock-forming sulfate mineral that occupies pockets or seams in volcanic rocks such as rhyolites, trachytes, and andesites, where it presumably formed through their chemical reaction with escaping sulfurous vapours. Allanite is a rare earth silicate of the epidote mineral group with the chemical formula Ca[REE]Al2Fe2+Si3O12(OH)[6]. allanite-(Ce) correspond totheilmenite series, andseem tohave formed from avolatile-enriched magma. Volume 83, Number 1-2 © Thomas Witzke / Abraxas-Verlag, GRapi = 14,180.81 (Gamma Ray American Petroleum Institute Units) Brown, drusy crystals were found in the type locality at Kelmis, Moresnet, Belgium. }, Valid Species (Pre-IMA) 1810 - Dana Number Modified from 58.2.1a.1. H2MgO3Si+2. else Minerals similar to or like Allanite. Make an impact. if (document.getElementsByTagName != null) Naming Acids Acids are divided into two groups: Binary and Oxyacids. B - Bonds On/Off “Allanite” is a poorly defined collection of species belonging to the epidote group. _uacct = "UA-3067463-1"; if (document.getElementById != null) If correct case is not used, the formula may be ambiguous and the interpretation chosen may not be the desired one. Allanite is similar to these minerals: Epidote, Titanite, Monazite and more. return; 1.07.5.1.1 Comparison of CAIs from different chondrite groups. To score good marks in chemistry, students have to memorize the chemical formula by heart. Canister Sizes: View All Red Dot ® Recipes. Metamictization is a natural, gradual process of destruction of the internal crystal structure of a mineral due to radiation present in the mineral or from nearby external radiation. PROP. Formula The general formula of the epidote group is X 2 Y 3 Z 3 (O,OH,F) 13 where X = Ca ... Allanite: reddish brown/brownish yellow ... rarely occurs in pure form. Still want to try? To use this package, add the following to your preamble: \usepackage [version=4] {mhchem} Chemical … H - Help Screen Allanite (also called orthite) is a sorosilicate group of minerals within the broader epidote group that contain a significant amount of rare-earth elements. View MINERAL ALIAS _ FORMULAS(1).docx from CHEMISTRY 311-400 at STI College (multiple campuses). Allanite and dollaseite-(Ce) have the same general epidote formula and contain metals of the cerium group. Disseminated - Occurs in small, distinct particles dispersed in matrix. the formation of an ionic compound like sodium chloride NaCl . html += printReadyElem.innerHTML; Principal Purpose: Light and standard 12 ga. target loads Secondary Uses: Handgun loads Remarks: The number one premium clay target powder, now 50 percent cleaner. quartz). We have detected that you are are on a small device such as a mobile phone. Point Group: 2=m: Crystals wedge-shaped, °attened k f001g or prismatic by extension along [110], to 16 cm; compact, massive. Allanite is usually metamict due to the presence of radioactive Cerium (Ce) in its chemical composition. Allanite Group of the Epidote Supergroup. Oxyacids consist of 3 elements, one of which is oxygen. S - Stereo Pair on/off } Biaxial (-), a=1.715-1.791, b=1.718-1.815, g=1.733-1.822, bire=0.0180-0.0310, 2V(Calc)=50-56, 2V(Meas)=40-80. CID 14768 (Metasilicic acid) printWin.document.write(html); if (gAutoPrint) Allanite definition: a rare black or brown mineral consisting of the hydrated silicate of calcium , aluminium... | Meaning, pronunciation, translations and examples Use our editor to draw your structure. The chemical data presented here were extracted from the literature (see Reference List) to produce a database for allanite and the other REE-rich epidote-group minerals. In external appearance allanite differs widely from epidote, being black or dark brown in color, pitchy in lustre, and opaque in the mass; further, there is little or no cleavage, and well-developed crystals are rare. "); Although this is an ad-equate description of the chemical composition of allanite-(Ce), it is not an end-member formula; rather, the formula describes a mixture of many distinct end-members. As part of a study of the structure and crystal chemistry of the epidote-group minerals, the first half of this paper reports the results refine- ment of the crystal structures of three members of this group: allanite, hancockite, and (high-iron) epidote. Simple; Structure; Advanced; History; Structure search. of “allanite”, allanite-(Ce), is defined as (Ce,Ca,Y) 2 (Al,Fe2+,Fe3+) 3(SiO 4) 3(OH). Scale: Picture size 10 mm. Package mhchem . function printSpecial() A very old chemical analysis (Penfield and Warren, 1899) leads to the probabie formula +2 Molecular Weight. { Allanite is usually metamict due to the presence of radioactive Cerium (Ce) in its chemical composition. Beryllium-rich varieties are known from the Polish Karkonosze Mts. Name: Allanite-(Ce) RRUFF ID: R080044 Ideal Chemistry: CaCe(Al 2 Fe 2+)[Si 2 O 7][SiO 4]O(OH) Locality: Aquarius Range, Mohave County, Arizona, USA Source: John Weber Owner: RRUFF Description: Dark brown fragment from metamict sample R060418, after heating at T = 850 C for 18 hours Status: The identification of this mineral has been confirmed only by X-ray diffraction a = 8.98, b = 5.75, c = 10.23, Z = 2; beta = 115° V = 478.74 Den(Calc)= 4.15. mhchem is a package used to typeset chemical formulae and equations. Clinozoisite shares a chemical formula and outward appearance (but not a crystal system) with zoisite. (Heinrich65). © John Veevaert, Mouse var headTags = document.getElementsByTagName("head"); Close mobile search navigation. quartz). var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); Greater than 70 Bq / gram. Concentration of Allanite-(Ce) per GRapi unit = 36.45 (PPM). Chemical formulas can be quite simple sometimes as H (Hydrogen), or it can take a rather complicated form, such as CH 3 CH 2 OH (ethanol). AND HANCOCKITE M9 hancockite is from Franklin, New Jersey, apparently its only known locality (Palache, 1935) The crystals are minute and poorly formed. In the past, “allanite” was defined as merely being lanthanon-bearing, but more recently, it is defined as being Ln-dominant at the A2 site.Species of the allanite subgroup include allanite-(Ce), allanite-(La), allanite-(Y), androsite-(La), dissakisite-(Ce), dollaseite-(Ce) and khristovite-(Ce). • Different flotation behaviors in the presence of EDA and R845N at certain pH ranges. alert("Could not find the printReady section in the HTML"); pale yellow, brownish yellow, brownish green, green, or brown. Español Attempts have been made from a study of the data on { printWin.document.write(html); (Heinrich65). Help on Above, Dollase W A , American Mineralogist , 56 (1971) p.447-464, Refinement of the crystal structures of epidote, allanite and hancockite, GRapi = 27,438.56 (Gamma Ray American Petroleum Institute Units) Joining DS Techeetah for the 2019/20 season, the Portuguese driver was unstoppable on his way to his first championship title. Location: Tiro Estrella Mine, El Capitan Mts., Lincoln Co., New Mexico, USA. The large well formed crystals of "allanite-(La)" from the Nueva Vizcaya Mine, Spain published by Del Tanago et al. Allanite X-ray compositional maps were acquired using EPMA at a 300 nA specimen current with a dwell time of 200 ms. Share. MINERAL Albite Allanite Alunite Annabergite … If you need to typeset chemical formulae, you have the choice between two very good packages: mhchem and chemmacros. urchinTracker(); Print or Cut-and-Paste your Allanite-(Y) Specimen Label here : printWin.document.close(); Formula CaCeFe 2+ Al 2 (Si 2 O 7)(SiO 4)O(OH) (RRUFF) Locality Otter Lake, Quebec, Canada. See bio. var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); ChemSpider Search and share chemistry. Allanite Group of the Epidote Supergroup.The La-analogue of Allanite-(Ce). Oxygen is normally not determined. View the SDS Scott, A.N. Draw structure Draw; Convert structure Convert; Load structure Load; Clean. Comments: Dual views of the same 0.8 cm Jet black allanite-(Ce) on quartz. } Yttrium 4.34 % Y 5.51 % Y 2 O 3. Massive - Granular - Common texture observed in granite and other igneous rock. Take care not to extend the area of contamination beyond its original boundary. Chemical Formula: (Ce,Ca,Y,La)2(Al,Fe+3)3(SiO4)3(OH) Crystal System: Triclinic In the Arthur E. Smith Collection, Wheaton College, Wheaton, Illinois. The effect can destroy a crystal lattice completely while leaving the outward appearance unchanged. Allanite grains and later alteration to monazite were identified in polished thin sections using BSE images. The forms commonly encountered are empirical, molecular, structural, and projection formulas. html += headTags[0].innerHTML; A comparison of the results of the various studies of allanite is difficult without recalculating for-mulae: there are at least ten methods of formula calcu-lation used in modern studies (post-1980). • Food, Grease, and Oily Stains: Spray immediately using either Formula 409®, or CRC 40173 Tannery Leather, Vinyl & More Cleaner & Conditioner, wiping with a soft cloth. P - Polyhedra On/Off Though these formulas are found to be very hard to learn and understand, very necessary to solve the reaction. The chemical composition of allanite was analyzed by EPMA at 15 keV, 20 nA, with a beam size ≤1 µm. html += '\n\n'; The mineral occurs mainly in metamorphosed clay-rich sediments and felsic igneous rocks. Calcium 3.91 % Ca 5.47 % CaO. Original Rockhounds Discussion Group Newly-crowned champion Antonio Felix da Costa is one of the longest standing drivers in Formula E having driven in every season to date. Accurate (± 1–3%) and precise (1–2%, 95%confidence level) SHRIMP 208 Pb/ 232 Th ages can be measured directly on allanite samples with REE + Th > 0.5 atoms per formula unit, without additional matrix corrections at a spatial resolution of 17 × 21 × 2μm. var gAutoPrint = true; // Flag for whether or not to automatically call the print function Krot, in Treatise on Geochemistry, 2007. var html = '\n\n'; Named after the Scottish mineralogist, T. Allan (1777-1833). Mineral Formulae Recalculation Exercise--This problem set uses the above spreadsheets to recalculate mineral formulae, assign cation site occupancy, determine relative proportions of end members, introduces important varieties of the rock forming minerals, and requires students to look critically at the data and assumptions that are built into numerous recalculation models. The standard formula is C = m/V, where C is the concentration, m is the mass of the solute dissolved, and V is the total volume of the solution. • Zeta potential, contact angle, bubble-particle attachment time were measured. For example, the molecular formula of hexane is: C 6 H … • Micro-flotation and conventional flotation experiments with pure and ore samples. alert("Sorry, the print ready feature is only available in modern browsers. html += '\n\n\n'; "); yellowish brown, reddish brown, brownish green, dark reddish brown, or greenish brown. Inmost cases, allanite incorporates ThandU.Decay ofthese elements causes metamictization (Giere &Sorensen 2004). } Ask about Allanite-(Y) here : Allanite is very rarely faceted and is usually metamict due to the presence of Cerium (Ce) in its chemical composition. } urchinTracker(); Print or Cut-and-Paste your Allanite-(Ce) Specimen Label here : Mineral Discussion Forum from Fabre Minerals - also available in S? pale yellow, brownish yellow, brownish green, green, or brown. In Namibia, Berg Aukas, in the Grootfontein District, produces acicular Willemite crystals. (Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP. Rockhounds Discussion Group on Yahoo Groups Often forms solid solutions with epidote.May also exist in a solid solution with CaCeAl 2 (Fe 3+ 2/3 1/3)[Si 2 O 7][SiO 4]O(OH) phase (Guastoni et al., 2017). Chemical formula, any of several kinds of expressions of the composition or structure of chemical compounds. As well as typeset basic 2D chemical structures. ChemSpider is a free chemical structure database providing fast access to over 34 million structures, properties and associated information. else It is assumed that each mineral is electrically neutral and that the positive charges on the cations are bala… The chemical composition of allanite was analyzed by EPMA at 15 keV, 20 nA, with a beam size ≤1 µm. Allanite often occurs in the metamict state due to the destruction of the crystalline structure by the bombardment of α (alfa) particles emitted by the radioactive constituents. } Synonyms. It usually contains some iron, like its series brother, epidote. An empirical formula consists of symbols representing elements in … E.R.D. Chemical Formula: Mg 2 Si 2 O 6: Composition: Magnesium silicate, often with significant iron impurities. Mindat.org's Discussion Groups if (gAutoPrint) Rinse with clean water. Enstatite. } var gAutoPrint = true; // Flag for whether or not to automatically call the print function A chemical formula is defined as a collection of chemical symbol that is used to show the elements present in any compound and its proportion. Epidotes belong to the sorosilicate structural division, in- dicating that the [SiO4] tetrahedral units in this mineral are found in groups of two tetrahedral units linked by a … html += '\n\n'; { { } If just most of the elements that can be found in allanite were shown, then the formula would be written as (Ca, Ce, Y, La, Th, Na, K)2(Al, Fe, Be, Mn, Mg)3(SiO4)3(OH), or Calcium Cerium Yttrium lanthanum Thorium Sodium Potassium Aluminum Iron Beryllium Manganese Magnesium Silicate Hydroxide. Allanite means the minerals belongs to epidote group-allanite subgroup, mainly allanite-(Ce) [CaCeAl 2 FeSi 3 O 12 (OH) 2] This study sums up the chemical composition of allanite from Ryoke granitoids, Cape Ashizuri granitoids, and Ohkueyama granitoids. Dispersion distinct to strong, r > v. colorless, pale yellow, yellowish brown, pink, or greenish yellow. Ask-A-Mineralogist from the Mineralogical Society of America Allanite-(Ce) is Radioactive as defined in 49 CFR 173.403. { { Original Rockhounds Discussion Group if (document.getElementById != null) Sorosilicate group of minerals within the broader epidote group that contain a significant amount of rare-earth elements. S. A ... A representative empirical formula, based on the composition of the least altered allanite grain, is: (Ln 0.83 Ca 1.07 Th 0.04 Mn 2+ 0.06)(Ti 4+ 0.11 Mg 2+ 0.04 Fe 0.99 Fe 3+ 0.48 Al 1.38)(Si 3.00 O 12)(OH 0.95 F 0.05) where Ln = (La 0.14 Ce 0.41 Pr 0.05 Nd 0.17 Sm 0.03 Y … Apatite does not require REE, but because it contains substantial REE in many rocks, it is included in this review. Named after the Scottish mineralogist, T. Allan (1777-1833). html += '\n\n\n'; Comments: Dark brown allanite-(Y) in matrix. The condensed structural formula may omit the symbols for carbon and hydrogen in the structure, simply indicating the chemical bonds and formulas of functional groups. Rockhounds Discussion Group on Yahoo Groups e.g. } Greater than 70 Bq / gram. Get involved Give your favourite driver a boost . Chemical bonding comments about the selected elements highlighted in white. a = 8.98, b = 5.75, c = 10.23, Z = 2; beta = 115° V = 478.74 Den(Calc)= 4.26. In chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. (2002) as “macroscopic La-dominant allanite and REE-rich epidote crystals” are zoned crystals containing allanite with Ce>La,allanite with La>Ce, and REE-rich epidote. Chemical Formula: (Ce,Ca,Y)2 (Al,Fe+++)3 (SiO4)3 (OH) Composition: Molecular Weight = 614.71 gm. Chemical Formula: CaCe(Fe+++,Fe++,Al)3[SiO4][Si2O7]O(OH) Composition: Molecular Weight = 613.85 gm Calcium 7.05 % Ca 9.87 % CaO Cerium 21.00 % Ce 24.60 % Ce 2 O 3 Titanium 1.09 % Ti 1.82 % TiO 2 Manganese 0.63 % Mn 0.81 % MnO Aluminum 2.99 % Al 5.65 % Al 2 O 3 Location: Boden, Marienberg District, Erzgebirge, Saxony, Germany. Article navigation. var html = '\n\n'; The allanite sample used for the surface chemistry studies was originated from the Mary Kathleen reserve in Queensland, Australia, and supplied by Aussie Minerals. Chemical test would be required to differentiate them. A … { PROP. if (headTags.length > 0) }, Valid Species (Pre-IMA) 1949 - Dana Number Modified from 58.2.1a.3. Allanite from ryoke and Hiroshima granite is allanite-(Ce), and later is rich in Y, MREE, and HREE. printWin.document.open(); printWin.document.open(); if (document.getElementsByTagName != null) var printReadyElem = document.getElementById("printReady"); Component Compounds. Metamictization eventually leaves the mineral amorphous or without any internal crystal structure. A comparison of CAIs from carbonaceous, ordinary and enstatite groups (Table 3) shows that most inclusion types can be found in many chondrite groups, and that the most common varieties of CAIs are spinel-, pyroxene-, and melilite-rich (e.g., Lin et al., 2006). Topic. alert("Sorry, the print ready feature is only available in modern browsers. However, a large amount of additional elements, including Th, U, Zr, P, Ba, Cr and others may be present in the mineral. SOMMAIRE Allanite, a cerium-bearing epidote occurring in the pegmatites of Kavarkattumalai, Madura District, has been studied in detail. Allanite-(Ce) belongs to epidote group and has the chemical formula CaCe(Al 2 Fe 2+ )(Si 2 O 7 )(SiO 4 )O(OH). Concentration of Allanite-(Y) per GRapi unit = 70.52 (PPM). Let us proceed further! } Home » ANU Research » ANU Theses » Open Access Theses » Allanite chemistry and the U-Th-Pb geochronology Allanite chemistry and the U-Th-Pb geochronology Download (442.81 MB) } return; Variable Formula (Mg,Fe)Si 2 O 6: Color: Gray, green, dark yellow, yellow-brown, greenish-brown, brown, black: Streak: Light brown to grayish-white: Hardness: 5 - 6: Crystal System: Orthorhombic Aluminum 9.88 % Al 18.66 % Al 2 O 3. $\definecolor{example}{RGB}{163,62,0}$ Please ensure Internet access and enable JavaScript. :RUCTURES OF EPIDOTE. ALLANITE. However, a large amount of additional elements, including Th, U, Be, Zr, P, Ba, Cr a… Regarding your first question, I suggest you employ judiciously chosen \newline directives. Botryoidal Willemite groups are found in the Potosí Mine, Santa Eulalia District, Chihuahua, Mexico. 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