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Pokrovskite

Big Photo

Lytton, Sonoma Co., California, USA
© 2007, J. Weissman

Show Pokrovskite Photos (3)
Formula:
Mg
 
2
[(OH)
 
2
|CO
 
3
]
System:MonoclinicColour:Pinkish-white to tan
Hardness:3


Rosasite Group.

Classification of Pokrovskite

IMA status:Approved
Strunz 8th edition ID:5/C.01-30
Nickel-Strunz 10th (pending) edition ID:5.BA.10

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
Dana 8th edition ID:16a.3.1.5

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)2(XO3)Zq
Hey's CIM Ref.:11.3.5

11 : Carbonates
3 : Carbonates of Mg
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Type Occurrence of Pokrovskite

Type Locality:Dunite lens, Zlatogorsk ultramafic intrusion, Zlatogorska Village, Kökshetaü Oblysy (Kokshatau [Kokchetav] Oblast'), Kazakhstan
Year of Discovery:1984

Physical Properties of Pokrovskite

Lustre:Waxy, Dull
Colour:Pinkish-white to tan
Hardness (Mohs):3

Crystallography of Pokrovskite

Crystal System:Monoclinic
Cell Parameters:a = 9.43Å, b = 12.27Å, c = 3.39Å
β = 96.6°
Ratio:a:b:c = 0.769 : 1 : 0.276
Unit Cell Volume:V 389.64 ų (Calculated from Unit Cell)

Optical Data of Pokrovskite

Type:Biaxial (-)
RI values: nα = 1.537 nβ = 1.611 nγ = 1.619
2V:Measured: 18° , Calculated: 34°
Maximum Birefringence:δ = 0.082

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:weak

Chemical Properties of Pokrovskite

Formula:
Mg
 
2
[(OH)
 
2
|CO
 
3
]
Essential elements:C, H, Mg, O
All elements listed in formula:C, H, Mg, O

Relationship of Pokrovskite to other Species

Member of Group:
Rosasite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
5.BA.05Azurite
Cu
 
3
[OH|CO
 
3
]
 
2
5.BA.10Georgeite
Cu
 
2
[(OH)
 
2
|CO
 
3
] · 6H
 
2
O
5.BA.10Glaukosphaerite
(Cu,Ni)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Kolwezite
(Cu,Co)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Malachite
Cu
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Mcguinnessite
(Mg,Cu)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Nullaginite
Ni
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Rosasite
(Cu,Zn)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Zincrosasite
(Zn,Cu)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Chukanovite
Fe
2+
2
[(OH)
 
2
|CO
 
3
]
5.BA.15Aurichalcite
(Zn,Cu)
 
5
[(OH)
 
3
|CO
 
3
]
 
2
5.BA.15Hydrozincite
Zn
 
5
[(OH)
 
3
|CO
 
3
]
 
2
5.BA.20Holdawayite
Mn
 
6
(CO
 
3
)
 
2
(OH)
 
7
(Cl,OH)
5.BA.25Defernite
Ca
 
6
(CO
 
3
)
 
2-x
(SiO
 
4
)
 
x
(OH)
 
7
(Cl,OH)
 
1-2x
 (x=0.5)
5.BA.25UM1977-03-COSiO:CaClH
Ca
 
10
(SiO
 
4
)(CO
 
3
)
 
7
(Cl,OH)
 
2
5.BA.30Loseyite
(Zn,Mn
2+
 
)
 
7
[(OH)
 
5
|CO
 
3
]
 
2
5.BA.30Sclarite
(Zn,Mg,Mn
2+
 
)
 
4
Zn
 
3
[(OH)
 
5
|CO
 
3
]
 
2
Related Minerals - Hey's Index Grouping:

- +
11.3.1Magnesite
MgCO
 
3
11.3.2Barringtonite
MgCO
 
3
·2H
 
2
O
11.3.3Nesquehonite
MgCO
 
3
·3H
 
2
O
11.3.4Lansfordite
MgCO
 
3
·5H
 
2
O
11.3.6Artinite
Mg
 
2
[(OH)
 
2
|CO
 
3
] · 3H
 
2
O
11.3.7Hydromagnesite
Mg
 
5
[(CO
 
3
)
 
4
(OH)
 
2
] · 4H
 
2
O
11.3.8Giorgiosite
Mg
 
5
[(CO
 
3
)
 
4
(OH)
 
2
] · 4H
 
2
O
11.3.9Dypingite
Mg
 
5
[OH|(CO
 
3
)
 
2
]
 
2
 · 5H
 
2
O
11.3.10Eitelite
Na
 
2
Mg(CO
 
3
)
 
2
11.3.11Mcguinnessite
(Mg,Cu)
 
2
[(OH)
 
2
|CO
 
3
]

Other Names for Pokrovskite

Synonyms:
IMA1982-054
Other Languages:
German:Pokrovskit
Spanish:Pokrovskita

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 Pokrovskite

Reference List:American Mineralogist (1985): 70: 217.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 113: 90-94.

Perchiazzi, N. & Merlino, S. (2006): The malachite-rosasite group: crystal structures of glaukosphaerite and pokrovskite. European Journal of Mineralogy, 18, 787-792.

Internet Links for Pokrovskite

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    Localities for Pokrovskite

    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.
    Germany
     
    • Bavaria
      • Upper Palatinate
        • Oberpfälzer Wald
          • Oberviechtach
            • Winklarn
    		Wittern: "Mineralfundorte in Deutschland", 2001
    Kazakhstan
     
    • Kökshetaü Oblysy (Kokshatau [Kokchetav] Oblast')
      • Zlatogorska Village
        • Zlatogorsk ultramafic intrusion
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    USA
     
    • California
      • San Benito Co.
    • Maryland
      • Montgomery Co.
        • Rockville
    		Min Rec 36:4 pp 435-446
    • Nevada
      • Nye Co.
        • Gabbs District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    Leonard S.Wiener and Sigrid Ballew,1995, Updated by Kenny Gay,2006, A Listing Of North Carolina Minerals,Geologic Note No.4
      • Jackson Co.
    		Jan H.Bernard and Jaroslav Hyrsl, 2004, Minerals and their Localities,pg 476
    • Pennsylvania
      • Lancaster Co.
        • Fulton Township
    		FM newsletter vol.31 no.1 Jan-Mar '01 pg.6
    Mineral and/or Locality
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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: 6th Nov 2009 04:25:51