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Embreyite

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

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Formula:
Pb
 
5
[PO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
System:MonoclinicHardness:3½
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):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
[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
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  • Embreyite details from Handbook of Mineralogy (PDF)
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    Localities for Embreyite

    Hide Locality List
    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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