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Embreyite Mineral Data

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General Embreyite Information

Help on Chemical  Formula: Chemical Formula: Pb5(CrO4)2(PO4)2•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Pb5(CrO4)2(PO4)2•(H2O)
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Berezov, Ekaterinburg (Sverdlovsk), Ural Mts, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for P. G. Embry
Help on Name Pronunciation: Name Pronunciation: Embreyite + Pronunciation Say EMBREYITE

Embreyite Image

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Comments: Orange embreyite crystals on matrix.
Location: Cumbria, England. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Embreyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7308:1:1.2659
Help on Cell Dimensions: Cell Dimensions: a = 9.755, b = 5.636, c = 7.135, Z = 1; beta = 103.08° V = 382.10 Den(Calc)= 6.41
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.167(1), 2.818(0.6), 4.751(0.6),

Physical Properties of Embreyite

Help on Cleavage: Cleavage: None
Help on Color: Color: Orange.
Help on Density: Density: 6.45
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: yellow

Optical Properties of Embreyite

Help on Gladstone-Dale: 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
Ncalc = 2.07 - 2.08
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.47 gm/cc
note: Specific Gravity of Embreyite =6.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEEmbreyite =1,272.31 barns/electron
U=PEEmbreyite x rElectron Density=6,961.23 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Embreyite is Not Radioactive

Embreyite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.03)(Hydrated Normal Compound Anions)
  (43.03.02)Dana Group Embreyite Pb5(CrO4)2(PO4)2•(H2O) P 21/m 2/m Cassedanneite Pb5(VO4)2(CrO4)2•(H2O) A2/m 2/m
Help on  Strunz Class: Strunz Class: 07.FC.20 07 - SULFATES (SELENATES, TELLURATES)
  07.F - Chromates
  07.FC -With PO4, AsO4, SiO4
07.FC.20 Cassedanneite Pb5(VO4)2(CrO4)2•(H2O) A2/m 2/m
07.FC.20 Embreyite Pb5(CrO4)2(PO4)2•(H2O) P 21/m 2/m

Other Embreyite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Embreyite :
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

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Dana No: Strunz No: 07.FC.20





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