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Embreyite

Formula:
Pb
 
5
[PO
 
4
|CrO
 
4
]
 
2
· H
 
2
O
System:MonoclinicHardness:
This page provides mineralogical data about Embreyite.

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

Hardness (Mohs):

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

- +
22.5.1Vauquelinite
Pb
 
2
Cu[OH|PO
 
4
|CrO
 
4
]
22.5.3Cassedanneite
Pb
 
5
[VO
 
4
|CrO
 
4
]
 
2
· H
 
2
O
22.5.4Fornacite
Pb
 
2
Cu[OH|AsO
 
4
|CrO
 
4
]
22.5.5Molybdofornacite
Pb
 
2
Cu[OH|(AsO
 
4
,PO
 
4
)|(MoO
 
4
,CrO
 
4
)]
22.5.6Mendozavilite
Na(Ca,Mg)
 
2
[Fe
 
6
(PO
 
4
)
 
2
(PMo
 
11
O
 
39
)(OH,Cl)
 
10
]·33H
 
2
O
22.5.7Paramendozavilite
NaAl
 
4
[Fe
 
7
(PO
 
4
)
 
5
(PMo
 
12
O
 
40
)(OH)
 
16
]·56H
 
2
O
22.5.8Betpakdalite
{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
22.5.9Natrobetpakdalite
(Na
 
2
,Ca)Fe
 
2
(As
 
2
Mo
 
6
O
 
28
)·15H
 
2
O
22.5.10Obradovicite
H
 
4
(K,Na)CuFe
 
2
AsO
 
4
(MoO
 
4
)
 
5
·12H
 
2
O
22.5.11Melkovite
CaFeH
 
6
(MoO
 
4
)
 
4
PO
 
4
·6H
 
2
O or near·
22.5.12Rankachite
(V
4+
 
,V
5+
 
)(W
6+
 
,Fe
3+
 
)
 
2
O
 
8
(OH)•(Ca
 
x
H
 
2
O
 
y
) with x ~ 0.5, y ~ 2.
22.5.13Olmsteadite
KFe
2+
2
(Nb
5+
 
,Ta
5+
 
)[O|PO
 
4
]
 
2
· 2H
 
2
O
22.5.14Johnwalkite
K(Mn
2+
 
,Fe
2+
 
,Fe
3+
 
)
 
2
(Nb
5+
 
,Ta
5+
 
)[O|PO
 
4
]
 
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:American Mineralogist: 58: 806.

Mineralogical Magazine: 38: 790-793.

Internet Links for Embreyite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Embreyite in the Natural History Museum (London) online catalogue
  • 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.
    (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.
    Russia
     
    • Urals Region
      • Middle Urals
        • Ekaterinburgskaya (Sverdlovskaya) Oblast'
          • Ekaterinburg (Sverdlovsk)
            • Berezovskii (Berezovskii Zavod)
    Am Min 73:11-12 p 1493
    South Africa
     
    • Gauteng Province
    No reference listed
    Minerals of South Africa
    Mineral and/or Locality
    Google
     
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 3rd Nov 2009 19:36:56