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Grischunite Mineral Data |
General Grischunite Information |
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NaCa2Mn++5Fe+++(AsO4)6•2(H2O) | ||
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Molecular Weight = 1,303.23 gm | ||
Sodium 1.76 % Na 2.38 % Na2O | |||
Calcium 6.15 % Ca 8.61 % CaO | |||
Manganese 21.08 % Mn 27.22 % MnO | |||
Iron 4.29 % Fe 6.13 % Fe2O3 | |||
Arsenic 34.49 % As 52.91 % As2O5 | |||
Hydrogen 0.31 % H 2.76 % H2O | |||
Oxygen 31.92 % O | |||
______ ______ | |||
100.00 % 100.00 % = TOTAL OXIDE | |||
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NaCa2Mn2+5Fe3+(AsO4)6•2(H2O) | ||
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Alteration product of sarkinite in a manganese deposit. | ||
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Approved IMA 1984 | ||
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Falotta mine, Oberhalbstein, Graub�unden, Switzerland. Link to MinDat.org Location Data. | ||
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Named from the former Romansch name Grischun for Graubunden Canton. | ||
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Grischunite + Pronunciation ![]() |
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ICSD 63431 | ||
PDF 38-387 | |||
Grischunite Image | |||
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Grischunite Crystallography |
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a:b:c =0.9531:1:0.8932 | ||
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a = 12.855, b = 13.487, c = 12.047, Z = 4; V = 2,088.65 Den(Calc)= 4.14 | ||
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Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcab | ||
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By Intensity(I/Io): 2.839(1), 3.15(0.9), 3.015(0.8), | ||
Physical Properties of Grischunite |
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{???} Perfect | ||
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Dark reddish brown. | ||
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3.8 | ||
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5 - Apatite | ||
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Vitreous (Glassy) | ||
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brown | ||
Optical Properties of Grischunite |
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CI meas= -0.086 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1899,KPDmeas= 0.2069,KC= 0.1906 Ncalc = 1.72 - 1.79 |
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Biaxial (+), a=1.784, b=1.785, g=1.79, bire=0.0060, 2V(Calc)=50, 2V(Meas)=40-50. | ||
Calculated Properties of Grischunite |
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Bulk Density (Electron Density)=3.89 gm/cc note: Specific Gravity of Grischunite =4.14 gm/cc. |
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Fermion Index = 0.0011451898 Boson Index = 0.9988548102 |
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PEGrischunite = 31.47 barns/electron U=PEGrischunite x rElectron Density= 122.38 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Grischunite is Not Radioactive |
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Grischunite Classification |
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40.02.11.01 (40)Hydrated Phosphates, etc | ||
(40.02)where A++ (B++)2 (XO4) � x(H2O) | |||
(40.02.11)Dana Group | |||
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08.CF.05 08 - PHOSPHATES, ARSENATES, VANADATES | ||
08.C - Phosphates without Additional Anions, with H2O | |||
08.CF -With large and medium-sized cations, RO4:H2O > 1:1 | |||
Other Grischunite Information |
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NAME( AntBidBlaNic4) 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 Grischunite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - GeoScienceWorld 6 - Google Images 7 - Google Scholar 8 - Handbook of Mineralogy (MinSocAm) 9 - Handbook of Mineralogy (UofA) 10 - MinDAT 11 - Mineralienatlas (Deutsch) 12 - Online Mineral Museum 13 - QUT Mineral Atlas 14 - Ruff.Info 15 - WWW-MINCRYST Search for Grischunite using: Visit our Advertisers for Grischunite : Ask about Grischunite here : Print or Cut-and-Paste your Grischunite Specimen Label here :
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