Embreyite Mineral Data + 
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- 43.3.2.1 Embreyite Pb5(CrO4)2(PO4)2·(H2O) P 21/m 2/m
- 43.3.2.2 Cassedanneite Pb5(VO4)2(CrO4)2·(H2O) A2/m 2/m
- VI/F.04-10 Embreyite Pb5(CrO4)2(PO4)2·(H2O) P 21/m 2/m
- VI/F.04-20 Cassedanneite Pb5(VO4)2(CrO4)2·(H2O) A2/m 2/m
General Embreyite Information |
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 Chemical Formula: |
Pb5(CrO4)2(PO4)2·(H2O) | ||
| Composition: |
Molecular Weight = 1,475.95 gm | ||
| Chromium 7.05 % Cr 13.55 % CrO3 | |||
| Phosphorus 4.20 % P 9.62 % P2O5 | |||
| Hydrogen 0.14 % H 1.22 % H2O | |||
| Lead 70.19 % Pb 75.61 % PbO | |||
| Oxygen 18.43 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Pb5(CrO4)2(PO4)2·(H2O) | ||
| IMA Status: |
Approved IMA 1972 | ||
| Locality: |
Berezov, Ekaterinburg (Sverdlovsk), Ural Mts, Russia Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for P. G. Embry | ||
Embreyite Image | |||
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Images:
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Embreyite Crystallography |
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| Axial Ratios: |
a:b:c =1.7308:1:1.2659 | ||
| Cell Dimensions: |
a = 9.755, b = 5.636, c = 7.135, Z = 1; beta = 103.08° V = 382.10 Den(Calc)= 6.41 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.167(1), 2.818(0.6), 4.751(0.6), | ||
Physical Properties of Embreyite |
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| Cleavage: |
None | ||
| Color: |
Orange. | ||
| Density: |
6.45 | ||
| Diaphaniety: |
Transparent to Translucent | ||
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. | ||
| Hardness: |
3.5 - Copper Penny | ||
| Luster: |
Earthy (Dull) | ||
| Streak: |
yellow | ||
Optical Properties of Embreyite |
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| Gladstone-Dale: |
CI meas= -0.208 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.216 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2038,KPDmeas= 0.2026,KC= 0.1677 |
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| Optical Data: |
Biaxial (-), a=2.2, b=2.36, g=2.36, bire=0.1600, 2V(Calc)=0, 2V(Meas)=0-10. | ||
Calculated Properties of Embreyite |
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| Electron Density: |
relectron=5.47 gm/cc |
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| Fermion Index |
Fermion Index = 0.1619 Boson Index = 0.8381 |
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| Photoelectric: |
PEEmbreyite =1,272.31 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Embreyite is Not Radioactive |
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Embreyite Classification |
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| Dana Class: |
43.3.2.1 (43)Compound Phosphates, etc. | ||
| (43.3)(Hydrated Normal Compound Anions) | |||
| (43.3.2)Dana Group | |||
| Strunz Class: |
VI/F.04-10 VI - Sulfates,Chromates,Molybdates and Tungstates | ||
| VI/F - Chromates [CrO4]2- | |||
| VI/F.04 - Embreyite - Cassedanneite series | |||
Other Embreyite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Embreyite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Embreyite using: Visit our Advertisers for Embreyite : Translate Embreyite Mineral Data : Ask about Embreyite here : Print or Cut-and-Paste your Embreyite Specimen Label here :
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