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General Brassite Information |
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 Chemical Formula: |
Mg(AsO3OH)•4(H2O) | ||
| Composition: |
Molecular Weight = 236.29 gm | ||
| Magnesium 10.29 % Mg 17.06 % MgO | |||
| Arsenic 31.71 % As 48.63 % As2O5 | |||
| Hydrogen 3.84 % H 34.31 % H2O | |||
| Oxygen 54.17 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Mg(AsO3OH)•4(H2O) | ||
| Environment: |
A rare reaction product of arsenic-rich solutions with Ca-Mg carbonates. | ||
| IMA Status: |
Approved IMA 1973 | ||
| Locality: |
From Jachymov (Joachimsthal), Czech Republic. Link to MinDat.org Location Data. | ||
| Name Origin: |
Honoring Rejane Brasse, who first synthesized the compound. | ||
| Name Pronunciation: |
Brassite  |
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| Synonym: |
ICSD 78 | ||
| PDF 23-1228 | |||
Brassite Image | |||
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Images:
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Brassite Crystallography |
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| Axial Ratios: |
a:b:c =0.686:1:1.5228 | ||
| Cell Dimensions: |
a = 7.472, b = 10.891, c = 16.585, Z = 8; V = 1,349.65 Den(Calc)= 2.33 | ||
| Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bca | ||
| X Ray Diffraction: |
By Intensity(I/Io): 4.97(1), 3.2(0.8), 4.14(0.6), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Brassite |
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| Cleavage: |
{001} Perfect | ||
| Color: |
White. | ||
| Density: |
2.28 | ||
| Streak: |
white | ||
Optical Properties of Brassite |
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| Gladstone-Dale: |
CI meas= -0.044 (Good) - where the CI = (1-KPDmeas/KC) CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2345,KPDmeas= 0.2396,KC= 0.2296 Ncalc = 1.52 - 1.53 |
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| Optical Data: |
Biaxial (+), a=1.531, b=1.546, g=1.562, bire=0.0310 | ||
Calculated Properties of Brassite |
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| Electron Density: |
Bulk Density (Electron Density)=2.33 gm/cc note: Specific Gravity of Brassite =2.33 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
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| Photoelectric: |
PEBrassite = 20.91 barns/electron U=PEBrassite x rElectron Density= 48.66 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Brassite is Not Radioactive |
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Brassite Classification |
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| Dana Class: |
39.01.07.01 (39)Hydrated Acid Phosphates, etc | ||
| (39.01)A+ [HXO4] · x(H2O) | |||
| (39.01.07)Dana Group | |||
| Strunz Class: |
08.CE.15 08 - PHOSPHATES, ARSENATES, VANADATES | ||
| 08.C - Phosphates without Additional Anions, with H2O | |||
| 08.CE -With only medium-sized cations, RO4:H2O £ 1:2.5 | |||
Other Brassite Information |
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| References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Brassite : 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 Brassite using: Visit our Advertisers for Brassite : A Bijoux Google Search for BrassiteAdam's Minerals Google Search for Brassite Cape Minerals Google Search for Brassite Dakota Matrix Minerals Google Search for Brassite Excalibur Mineral Corp. Google Search for Brassite Exceptional Minerals Google Search for Brassite John Betts Fine Minerals Search for Brassite McDougall Minerals Google Search for Brassite Mineral News Website Link Rock and Mineral Shows Google Search for Brassite Weinrich Minerals, Inc. Google Search for Brassite Ask about Brassite here : Print or Cut-and-Paste your Brassite Specimen Label here :
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