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Embreyite

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Big Photo

Callenberg North (No. 1) open cut, Callenberg, Glauchau, Saxony, Germany
© Thomas Witzke

Show Embreyite Photos (8)



Formula:
Pb
 
5
(CrO
 
4
)
 
2
(PO
 
4
)
 
2
 · H
 
2
O
System:MonoclinicColour:Orange
Hardness:3½
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.

Classification of Embreyite

IMA status:Approved 1971
Strunz 8th edition ID:6/F.04-10
Nickel-Strunz 10th (pending) edition ID:7.FC.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4
Dana 8th edition ID:43.3.2.1

43 : COMPOUND PHOSPHATES, ETC.
3 : Hydrated Normal Compound Phosphates, etc·
Hey's CIM Ref.:22.5.2

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

Type Locality:Berezovskoe Au Deposit (Berezovsk Mines), Berezovskii (Berezovskii Zavod), Ekaterinburg (Sverdlovsk), Ekaterinburgskaya (Sverdlovskaya) Oblast', Middle Urals, Urals Region, Russia
Year of Discovery:1972

Physical Properties of Embreyite

Colour:Orange
Comment:Various shades of orange
Streak:Yellow
Hardness (Mohs):3½

Crystallography of Embreyite

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

Optical Data of Embreyite

Type:Biaxial (-)
RI values: nα = 2.200 nβ = 2.360 nγ = 2.360
Maximum Birefringence:δ = 0.160

Chart 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 Embreyite

Formula:
Pb
 
5
(CrO
 
4
)
 
2
(PO
 
4
)
 
2
 · H
 
2
O
Essential elements:Cr, H, O, P, Pb
All elements listed in formula:Cr, H, O, P, Pb

Relationship of Embreyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.FC.05Vauquelinite
Pb
 
2
Cu(CrO
 
4
)(PO
 
4
)(OH)
7.FC.10Fornacite
Pb
 
2
Cu(CrO
 
4
)(AsO
 
4
)(OH)
7.FC.10Molybdofornacite
Pb
 
2
Cu(MoO
 
4
,CrO
 
4
)(AsO
 
4
,PO
 
4
)(OH)
7.FC.15Hemihedrite
Pb
 
10
Zn(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
7.FC.15Iranite
Pb
 
10
Cu(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
7.FC.20Cassedanneite
Pb
 
5
(CrO
 
4
)
 
2
(VO
 
4
)
 
2
 · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
22.5.1Vauquelinite
Pb
 
2
Cu(CrO
 
4
)(PO
 
4
)(OH)
22.5.3Cassedanneite
Pb
 
5
(CrO
 
4
)
 
2
(VO
 
4
)
 
2
 · H
 
2
O
22.5.4Fornacite
Pb
 
2
Cu(CrO
 
4
)(AsO
 
4
)(OH)
22.5.5Molybdofornacite
Pb
 
2
Cu(MoO
 
4
,CrO
 
4
)(AsO
 
4
,PO
 
4
)(OH)
22.5.6Mendozavilite-NaFe
Na(Ca,Mg)
 
2
Fe
3+
6
(PMo
 
11
O
 
39
)(PO
 
4
)
 
2
(OH,Cl)
 
10
 · 33H
 
2
O
22.5.7Paramendozavilite
NaAl
 
4
Fe
3+
7
(PMo
 
12
O
 
40
)(PO
 
4
)
 
5
(OH)
 
16
 · 56H
 
2
O
22.5.8Betpakdalite-CaCa
{Mg(H
 
2
O)
 
6
}Ca
 
2
(H
 
2
O)
 
13
[Mo
6+
8
As
5+
2
Fe
3+
3
O
 
36
(OH)](H
 
2
O)
 
4
22.5.9Betpakdalite-NaCa
(Na
 
2
,Ca)Fe
 
2
(As
 
2
Mo
 
6
O
 
28
) · 15H
 
2
O
22.5.10Obradovicite-KCu
H
 
4
(K,Na)CuFe
 
2
(MoO
 
4
)
 
5
(AsO
 
4
) · 12H
 
2
O
22.5.11Melkovite
CaFe
3+
2
Mo
 
5
(PO
 
4
)
 
2
O
 
10
(OH)
 
12
 · 8H
 
2
O
22.5.12Rankachite
Ca
 
0.5
(V
4+
 
,V
5+
 
)(W
6+
 
,Fe
3+
 
)
 
2
O
 
8
(OH) · 2H
 
2
O
22.5.13Olmsteadite
KFe
2+
2
(Nb
5+
 
,Ta
5+
 
)(PO
 
4
)
 
2
O
 
2
 · 2H
 
2
O
22.5.14Johnwalkite
K(Mn
2+
 
,Fe
2+
 
,Fe
3+
 
)
 
2
(Nb
5+
 
,Ta
5+
 
)(PO
 
4
)
 
2
O
 
2
 · 2(H
 
2
O,OH)

Other Names for Embreyite

Synonyms:
IMA1971-048
Other Languages:
German:Embreyit
Spanish:Embreyita

Other Information

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

References for Embreyite

Reference List:

- +
Williams, S. A. (1972): Embreyite, a new mineral from Berezov, Siberia. Mineralogical Magazine 38, 790-793.

American Mineralogist: 58: 806.


Internet Links for Embreyite

Search Engines:
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    • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Embreyite details from Handbook of Mineralogy (PDF)
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    • Localities for Embreyite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    France
     
    • 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
     
    • Urals Region
      • Middle Urals
        • Ekaterinburgskaya (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
     
    • Gauteng Province
    		No reference listed
    Minerals of South Africa
    Mineral and/or Locality
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