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Embreyite

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Formula:
Pb5(CrO4)2(PO4)2 · H2O
Colour:
Orange
Hardness:
Crystal System:
Monoclinic
Name:
Named in honor of Peter Godwin Embrey (1929-2010), British Museum. His achievements in the science included the reprint of Greg and Lettsom's British Mineralogy in 1977, and Minerals of Cornwall and Devon published in 1987.

May be confused with descloizite.


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Classification of EmbreyiteHide

Approved
Approval Year:
1971
7.FC.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4
43.3.2.1

43 : COMPOUND PHOSPHATES, ETC.
3 : Hydrated Normal Compound Phosphates, etc·
22.5.2

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate

Physical Properties of EmbreyiteHide

Colour:
Orange
Comment:
Various shades of orange
Streak:
Yellow
Hardness:
3½ on Mohs scale

Optical Data of EmbreyiteHide

Type:
Biaxial (-)
RI values:
nα = 2.200 nβ = 2.360 nγ = 2.360
Max Birefringence:
δ = 0.160
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively strong

Chemical Properties of EmbreyiteHide

Formula:
Pb5(CrO4)2(PO4)2 · H2O

Crystallography of EmbreyiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 9.75 Å, b = 5.63 Å, c = 7.13 Å
β = 103.08°
Ratio:
a:b:c = 1.732 : 1 : 1.266
Unit Cell V:
381.23 ų (Calculated from Unit Cell)

Type Occurrence of EmbreyiteHide

Synonyms of EmbreyiteHide

Other Language Names for EmbreyiteHide

German:Embreyit
Spanish:Embreyita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Vauquelinite7 photos of Embreyite associated with Vauquelinite on mindat.org.
Crocoite6 photos of Embreyite associated with Crocoite on mindat.org.
Mimetite2 photos of Embreyite associated with Mimetite on mindat.org.
Cerussite1 photo of Embreyite associated with Cerussite on mindat.org.
Bindheimite1 photo of Embreyite associated with Bindheimite on mindat.org.
Pyromorphite1 photo of Embreyite associated with Pyromorphite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.FC.05VauquelinitePb2Cu(CrO4)(PO4)(OH)Mon. 2/m
7.FC.10FornacitePb2Cu(CrO4)(AsO4)(OH)Mon. 2/m : P21/b
7.FC.10MolybdofornacitePb2Cu(MoO4,CrO4)(AsO4,PO4)(OH)Mon.
7.FC.15HemihedritePb10Zn(CrO4)6(SiO4)2(OH)2Tric.
7.FC.15IranitePb10Cu(CrO4)6(SiO4)2(OH)2Tric.
7.FC.20CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.

Related Minerals - Dana Grouping (8th Ed.)Hide

43.3.2.2CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.5.1VauquelinitePb2Cu(CrO4)(PO4)(OH)Mon. 2/m
22.5.3CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.
22.5.4FornacitePb2Cu(CrO4)(AsO4)(OH)Mon. 2/m : P21/b
22.5.5MolybdofornacitePb2Cu(MoO4,CrO4)(AsO4,PO4)(OH)Mon.
22.5.6Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m
22.5.7ParamendozaviliteNaAl4Fe7(PO4)5(PMo12O40)(OH)16 · 56H2OMon.
22.5.8Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.9Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m : B2/m
22.5.10Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Orth. mmm (2/m 2/m 2/m) : Pmna
22.5.11Melkovite[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.12RankachiteCa0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2OMon. 2/m : P21/m
22.5.13OlmsteaditeKFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2OOrth.
22.5.14JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for EmbreyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Williams, S. A. (1972): Embreyite, a new mineral from Berezov, Siberia. Mineralogical Magazine 38, 790-793.
American Mineralogist: 58: 806.

Internet Links for EmbreyiteHide

Localities for EmbreyiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
France
 
  • Nouvelle-Aquitaine
    • Dordogne
      • Nontron
Cuchet, S., Ansermet S. & Meisser, N. (2008) L'embreyite et l'hisingerite du filon du Cantonnier, Nontron, Dordogne (France), Le Règne Minéral, 84, 23-24.
Germany
 
  • Saxony
    • Glauchau
      • Callenberg
Lapis, 16 (9), 13-26; Witzke, T. (1993): Neufunde aus Sachsen. Lapis, 18 (12), 15.
Russia (TL)
 
  • Urals Region
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Ekaterinburg (Sverdlovsk)
          • Berezovskii (Berezovskii Zavod)
Williams S A (1972) Embreyite, a new mineral from Berezov, Siberia, Mineralogical Magazine 38, 790-793
Pavel M. Kartashov data
South Africa
 
  • Mpumalanga Province
    • Nkangala District
      • Delmas
Southwood, M. J., & Viljoen, E. A. (1986). Lead chromate minerals from the Argent lead− silver mine, Transvaal, South Africa: crocoite, vauquelinite, and a possible second occurrence of embreyite. Mineralogical Magazine, 50(4), 728-730.
Minerals of South Africa
Mineral and/or Locality  
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