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Almandine Mineral Data |
General Almandine Information |
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Fe++3Al2(SiO4)3 | ||
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Molecular Weight = 497.75 gm | ||
Aluminum 10.84 % Al 20.48 % Al2O3 | |||
Iron 33.66 % Fe 43.30 % FeO | |||
Silicon 16.93 % Si 36.21 % SiO2 | |||
Oxygen 38.57 % O | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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Fe2+3Al2(SiO4)3 | ||
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Metamorphic and pegmatitic rocks. | ||
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Valid Species (Pre-IMA) Prehistoric | ||
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Alabanda in Asia Minor. Link to MinDat.org Location Data. | ||
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Named after its locality. | ||
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Almandine + Pronunciation ![]() |
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Almandite | ||
ICSD 28030 | |||
PDF 41-1423 | |||
Almandine Image | |||
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Almandine Crystallography |
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a = 11.526, Z = 8; V = 1,531.21 Den(Calc)= 4.32 | ||
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Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d | ||
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By Intensity(I/Io): 2.569(1), 1.54(0.5), 2.873(0.4), | ||
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Mouse |
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Physical Properties of Almandine |
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None | ||
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Brown, Brownish red, Red, Black, Black red. | ||
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4.09 - 4.31, Average = 4.19 | ||
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Transparent to Subtransparent to translucent | ||
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Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | ||
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Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
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Massive - Lamellar - Distinctly foliated fine-grained forms. | ||
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7-8 | ||
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Non-fluorescent. | ||
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Vitreous - Resinous | ||
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white | ||
Optical Properties of Almandine |
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CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1921,KPDmeas= 0.1976,KC= 0.1991 Ncalc = 1.81 - 1.86 |
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Isotropic, n=1.83. | ||
Calculated Properties of Almandine |
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Bulk Density (Electron Density)=4.08 gm/cc note: Specific Gravity of Almandine =4.20 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PEAlmandine = 11.03 barns/electron U=PEAlmandine x rElectron Density= 45.06 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Almandine is Not Radioactive |
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Almandine Classification |
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51.04.03a.02 (51)Nesosilicate Insular SiO4 Groups Only | ||
(51.04)with cations in [6] and >[6] coordination | |||
(51.04.03a)Garnet group (Pyralspite series) | |||
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09.AD.25 09 - SILICATES (Germanates) | ||
09.A - Nesosilicates | |||
09.AD -Nesosilicates without additional anions; | |||
Other Almandine Information |
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NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
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Links to other databases for Almandine : 1 - Alkali-Nuts(English) 2 - Am. Min. Crystal Structure Database 3 - Amethyst Galleries' Mineral Gallery 4 - Athena 5 - CalTech Mineral Spectroscopy 6 - Franklin Minerals(Dunn) 7 - GeoScienceWorld 8 - Google Images 9 - Google Scholar 10 - Handbook of Mineralogy (MinSocAm) 11 - Handbook of Mineralogy (UofA) 12 - HyperPhysics 13 - MinDAT 14 - Mineral and Gemstone Kingdom 15 - Mineral of the Month 16 - Mineralienatlas (Deutsch) 17 - Online Mineral Museum 18 - Philatelic Mineralogy 19 - QUT Mineral Atlas 20 - Ruff.Info 21 - Scandinavian mineral gallery 22 - UCLA - Petrography Thin-Sections 23 - University of Colorado - Mineral Structure Data 24 - University of Texas at Austin 25 - WWW-MINCRYST Search for Almandine using: Visit our Advertisers for Almandine : Ask about Almandine here : Print or Cut-and-Paste your Almandine Specimen Label here :
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