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Pokrovskite

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Lytton, Sonoma Co., California, USA
© 2007, JGW

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Formula:
Mg
 
2
(CO
 
3
)(OH)
 
2
System:MonoclinicColour:Pinkish-white to tan
Hardness:3
Member of:Rosasite Group


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, Zlatogorsk, Northern Kazakhstan Province (Soltüstik Qazaqstan Oblysy; Severo-Kazakhstanskaya 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
(CO
 
3
)(OH)
 
2
Essential elements:C, H, Mg, O
All elements listed in formula:C, H, Mg, O

Relationship of Pokrovskite to other Species

Member of:Rosasite Group
Other Members of Group:

- +
Glaukosphaerite
(Cu,Ni)
 
2
(CO
 
3
)(OH)
 
2
Mcguinnessite
(Mg,Cu)
 
2
(CO
 
3
)(OH)
 
2
Parádsasvárite
Zn
 
2
(CO
 
3
)(OH)
 
2
Rosasite
(Cu,Zn)
 
2
(CO
 
3
)(OH)
 
2
Zincrosasite
(Zn,Cu)
 
2
(CO
 
3
)(OH)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
5.BA.05Azurite
Cu
 
3
(CO
 
3
)
 
2
(OH)
 
2
5.BA.10Georgeite
Cu
 
2
(CO
 
3
)(OH)
 
2
 · 6H
 
2
O
5.BA.10Glaukosphaerite
(Cu,Ni)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Kolwezite
(Cu,Co)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Malachite
Cu
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Mcguinnessite
(Mg,Cu)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Nullaginite
Ni
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Rosasite
(Cu,Zn)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Zincrosasite
(Zn,Cu)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Chukanovite
Fe
2+
2
(CO
 
3
)(OH)
 
2
5.BA.15Aurichalcite
(Zn,Cu)
 
5
(CO
 
3
)
 
2
(OH)
 
6
5.BA.15Hydrozincite
Zn
 
5
(CO
 
3
)
 
2
(OH)
 
6
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
(CO
 
3
)
 
2
(OH)
 
10
5.BA.30Sclarite
(Zn,Mg,Mn
2+
 
)
 
4
Zn
 
3
(CO
 
3
)
 
2
(OH)
 
10
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
(CO
 
3
)(OH)
 
2
 · 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
 · 5-6H
 
2
O
11.3.9Dypingite
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
 · 5H
 
2
O
11.3.10Eitelite
Na
 
2
Mg(CO
 
3
)
 
2
11.3.11Mcguinnessite
(Mg,Cu)
 
2
(CO
 
3
)(OH)
 
2

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

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

    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.
    Germany
     
    • Bavaria
      • Upper Palatinate
        • Oberpfälzer Wald
          • Oberviechtach
            • Winklarn
    		Wittern: "Mineralfundorte in Deutschland", 2001
    Kazakhstan
     
    • Northern Kazakhstan Province (Soltüstik Qazaqstan Oblysy; Severo-Kazakhstanskaya Oblast')
      • Zlatogorsk
        • 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.
    		G. C. Jones and B. Jackson (1993) Infrared Transmission Spectra of Carbonate Minerals. Chapman and Hall
      • Sonoma Co.
    		Frost, Ray L. (2006) A Raman spectroscopic study of selected minerals of the rosasite group. Journal of Raman Spectroscopy 37(9):pp. 910-921.
    • 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.
        • State Line Chromite District
          • Fulton Township
    		FM newsletter vol.31 no.1 Jan-Mar '01 pg.6
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