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Anorthite Mineral Data + |
General Anorthite Information |
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| CaAl2Si2O8 | |||
| Molecular Weight = 277.41 gm | |||
| Sodium 0.41 % Na 0.56 % Na2O | |||
| Calcium 13.72 % Ca 19.20 % CaO | |||
| Aluminum 18.97 % Al 35.84 % Al2O3 | |||
| Silicon 20.75 % Si 44.40 % SiO2 | |||
| Oxygen 46.14 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Na0.05Ca0.95Al1.95Si2.05O8 | |||
| Magmatic and metamorphic rocks. | |||
| Valid Species (Pre-IMA) 1823 | |||
| Monte Somma and Valle di Fassa, Italy. Link to MinDat.org Location Data. | |||
| From the Greek, an + orthos, "not upright" in allusion to the oblique crystals. | |||
| Ab0 | |||
| An100 | |||
| ICSD 654 | |||
| Indianite | |||
| PDF 41-1486 | |||
Anorthite Image | |||
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Anorthite Crystallography |
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| a:b:c =0.635:1:1.1003 | |||
| a = 8.177, b = 12.877, c = 14.169, Z = 8; alpha = 93.166°, beta = 115.85°, gamma = 91.216° V = 1,340.29 Den(Calc)= 2.75 | |||
| Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1,I1 | |||
| By Intensity(I/Io): 3.2(1), 3.18(0.75), 4.04(0.6), | |||
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Physical Properties of Anorthite |
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| [001] Perfect, [010] Good | |||
| Colorless, Gray, White, Red, Reddish gray. | |||
| 2.72 - 2.75, Average = 2.73 | |||
| Transparent to Subtransparent to translucent | |||
| Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | |||
| Euhedral Crystals - Occurs as well-formed crystals showing good external form. | |||
| Granular - Generally occurs as anhedral to subhedral crystals in matrix. | |||
| Striated - Parallel lines on crystal surface or cleavage face. | |||
| 6 - Orthoclase | |||
| None. | |||
| Vitreous (Glassy) | |||
| white | |||
Optical Properties of Anorthite |
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| CI meas= -0.02 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.211,KPDmeas= 0.2121,KC= 0.2079 |
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| Biaxial (-), a=1.572-1.576, b=1.5785-1.5832, g=1.583-1.588, bire=0.0110-0.0120, 2V(Calc)=78, 2V(Meas)=78. Dispersion relatively weak. | |||
| colorless. | |||
| colorless. | |||
| colorless. | |||
Calculated Properties of Anorthite |
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relectron=2.73 gm/cc |
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| Fermion Index = 0.01009 Boson Index = 0.98991 |
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PEAnorthite = 3.05 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Anorthite is Not Radioactive |
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Anorthite Classification |
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| 76.1.3.6 (76)Tectosilicate Al-Si Framework | |||
| (76.1)with Al-Si frameworks | |||
| (76.1.3)Plagioclase series | |||
| VIII/J.07-70 VIII - Silicates | |||
| VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders | |||
| VIII/J.07 - Feldspar group, Anorthoclase - Anorthite - Banalcite series | |||
Other Anorthite Information |
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| NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | |||
| Links to other databases for Anorthite : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 - Franklin Minerals(Dunn) 7 - Franklin Minerals(Palache) 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 - HyperPhysics 13 -MinDAT 14 -MinMax(Deutsch) 15 -MinMax(English) 16 -Mineralienatlas (Deutsch) 17 -QUT Mineral Atlas 18 - UCLA - Petrography Thin-Sections 19 - University of Manchester - Mineral Structure 20 - WWW-MINCRYST 21 -École des Mines de Paris Search for Anorthite using: Visit our Advertisers for Anorthite : Translate Anorthite Mineral Data : Ask about Anorthite here : Print or Cut-and-Paste your Anorthite Specimen Label here :
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