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Embreyite

A valid IMA mineral species
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About EmbreyiteHide

01524780015307892842650.jpg
Peter Embrey
Formula:
Pb5(CrO4)2(PO4)2 · H2O
Colour:
Dull orange
Lustre:
Resinous, Dull
Hardness:
Specific Gravity:
6.45
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.
See also https://www.mindat.org/mesg-631485.html for more info on Peter Embrey.
May be confused with descloizite.

Most likely the P analogue of cassedanneite.


Unique IdentifiersHide

Mindat ID:
1373
Long-form identifier:
mindat:1:1:1373:0
GUID
(UUID V4):
e0fb1f83-aa1f-4fe5-a1d2-acfc6a0a2c10

IMA Classification of EmbreyiteHide

Classification of EmbreyiteHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
EmbIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of EmbreyiteHide

Resinous, Dull
Transparency:
Transparent, Translucent
Comment:
Dull to resinous
Colour:
Dull orange
Comment:
Various shades of orange.
Streak:
Yellow
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
6.45(12) g/cm3 (Measured)    6.564 g/cm3 (Calculated)

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
Optical Extinction:
Y = b.
Pleochroism:
Weak
Comments:
X = honey-yellow; Y = Z = amber.

Chemistry of EmbreyiteHide

Mindat Formula:
Pb5(CrO4)2(PO4)2 · H2O

Crystallography of EmbreyiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 9.802(16) Å, b = 5.603(9) Å, c = 7.649(12) Å
β = 114.85°
Ratio:
a:b:c = 1.749 : 1 : 1.365
Unit Cell V:
381.2 ų
Z:
1
Twinning:
Multiple twinning and 60° sector zoning observed optically.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.167 Å(100)
4.751 Å(60)
2.818 Å(60)
1.917 Å(45)
3.563 Å(32)
2.213 Å(32)
2.187 Å(31)

Geological EnvironmentHide

Type Occurrence of EmbreyiteHide

General Appearance of Type Material:
Thick botryoidal crusts consisting of tiny tabular crystals with the plane of flattening approximately normal to the surface of the crust.
Place of Conservation of Type Material:
The Natural History Museum, London, England, number 39316.
Associated Minerals at Type Locality:
Reference:
Williams, S. A. (1972) Embreyite, a new mineral from Berezov, Siberia. Mineralogical Magazine: 38: 790-793.

Synonyms of EmbreyiteHide

Other Language Names for EmbreyiteHide

German:Embreyit
Spanish:Embreyita

Common AssociatesHide

Associated Minerals Based on Photo Data:
29 photos of Embreyite associated with PyromorphitePb5(PO4)3Cl
23 photos of Embreyite associated with CrocoitePbCr6+O4
15 photos of Embreyite associated with VauquelinitePb2Cu(CrO4)(PO4)(OH)
3 photos of Embreyite associated with MimetitePb5(AsO4)3Cl
2 photos of Embreyite associated with TrippkeiteCu2+As3+2O4
1 photo of Embreyite associated with CerussitePbCO3
1 photo of Embreyite associated with BindheimitePb2Sb2O6O
1 photo of Embreyite associated with ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
1 photo of Embreyite associated with ShattuckiteCu5(Si2O6)2(OH)2
1 photo of Embreyite associated with QuartzSiO2

Related Minerals - Strunz-mindat 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. 2/m : P21/b
7.FC.15HemihedritePb10Zn(CrO4)6(SiO4)2(OH)2Tric. 1 : P1
7.FC.15IranitePb10Cu(CrO4)6(SiO4)2(OH)2Tric. 1 : P1
7.FC.15RaygrantitePb10Zn(SO4)6(SiO4)2(OH)2Tric. 1 : P1
7.FC.20CassedanneitePb5(CrO4)2(VO4)2 · H2OMon. 2/m

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.

Internet Links for EmbreyiteHide

References 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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
France
 
  • Nouvelle-Aquitaine
    • Dordogne
      • Nontron
        • Nontron
Cuchet et al. (2008)
Germany
 
  • Saxony
    • Zwickau District
      • Callenberg
Leonhardt et al. (1991) +1 other reference
Russia (TL)
 
  • Sverdlovsk Oblast
    • Beryozovsky
Williams (1972)
Pavel.M. Kartashov (n.d.)
South Africa
 
  • Mpumalanga
    • Nkangala District Municipality
      • Victor Khanye Local Municipality
        • Delmas
Southwood et al. (1986)
Cairncross et al. (1995)
            • Dwarsfontein Farm
              • Transvaal Mine
SAMS (South African Micromount Society)
USA
 
  • Arizona
    • Mohave County
      • Artillery Mountains
        • Rawhide Wash
Möckel (2018)
 
矿物 and/or 产地  
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