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Pokrovskite Mineral Data

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General Pokrovskite Information

Help on Chemical  Formula: Chemical Formula: Mg2(CO3)(OH)2•0.5(H2O)
Help on Composition: Composition: Molecular Weight = 151.64 gm
   Magnesium  32.06 %  Mg   53.16 % MgO
   Hydrogen    1.99 %  H    17.82 % H2O
   Carbon      7.92 %  C    29.02 % CO2
   Oxygen     58.03 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2(CO3)(OH)2•0.5(H2O)
Help on Environment: Environment: Ultramafic bodies of dunite or serpentinite.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Drillhole in the Zlatogorsk massif, 90 km west-southwest of Kokchetav, Kazakhstan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pavel Vladimirovich Pokrovskii (1912-1979), Russian mineralogist, Institute of Geology and Geochemistry, Sverdlovsk, Russia.
Help on Name Pronunciation: Name Pronunciation: Pokrovskite + Pronunciation Say POKROVSKITE
 

Pokrovskite Image

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  Pokrovskite   Hydromagnesite

Comments: Tan spherical pokrovskite on serpentinite rock with white hydromagnesite sprays.
Location: KCA Quarry, San Benito County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pokrovskite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7685:1:0.2766
Help on Cell Dimensions: Cell Dimensions: a = 9.43, b = 12.27, c = 3.395, Z = 4; beta = 96.6° V = 390.22 Den(Calc)= 2.58
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.6(1), 2.17(0.9), 6.1(0.7),
 

Physical Properties of Pokrovskite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Beige yellow, White, Pink.
Help on Density: Density: 2.51 - 2.52, Average = 2.51
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white
 

Optical Properties of Pokrovskite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2283,KPDmeas= 0.2342,KC= 0.2281
Ncalc = 1.57 - 1.59
Help on Optical Data: Optical Data: Biaxial (-), a=1.537, b=1.611, g=1.619, bire=0.0820, 2V(Calc)=34, 2V(Meas)=18.
 

Calculated Properties of Pokrovskite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Pokrovskite =2.58 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEPokrovskite = 0.87 barns/electron
U=PEPokrovskite x rElectron Density= 2.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pokrovskite is Not Radioactive
 

Pokrovskite Classification

Help on  Dana Class: Dana Class: 16a.03.02.03 (16a)Carbonates - Hydroxyl or Halogen
  (16a.03)where (A B)2 (XO3) Zq
  (16a.03.02)Malachite Group
 
16a.03.02.01 Malachite Cu2(CO3)(OH)2 P 21/a 2/m
 
16a.03.02.02 Nullaginite Ni2(CO3)(OH)2 P 21/m,P 21 Mono
 
16a.03.02.03 Pokrovskite Mg2(CO3)(OH)2•0.5(H2O) P 21/a 2/m
 
16a.03.02.04 Chukanovite! Fe2(CO3)(OH)2 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 05.BA.10 05 - CARBONATES (NITRATES)
  05.B - Carbonates with additional anions, without H2O
  05.BA -With Cu, Co, Ni, Zn, Mg, Mn
 
05.BA.10 Nullaginite Ni2(CO3)(OH)2 P 21/m,P 21 Mono
 
05.BA.10 Georgeite Cu5(CO3)3(OH)4•6(H2O) None
 
05.BA.10 Malachite Cu2(CO3)(OH)2 P 21/a 2/m
 
05.BA.10 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 21/a 2/m
 
05.BA.10 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 21/a 2/m
 
05.BA.10 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri
 
05.BA.10 Pokrovskite Mg2(CO3)(OH)2•0.5(H2O) P 21/a 2/m
 
05.BA.10 Rosasite (Cu,Zn)2(CO3)(OH)2 P 21/a 2/m
 
05.BA.10 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 21/a 2/m
 
05.BA.10 Chukanovite! Fe2(CO3)(OH)2 P 21/a 2/m
 

Other Pokrovskite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Pokrovskite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Pokrovskite Specimen Label here :

Pokrovskite

Mg2(CO3)(OH)2•0.5(H2O)
Dana No: 16a.03.02.03 Strunz No: 05.BA.10
Locality:

 

Notes:

 

 
   
 


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