Mineralogy Database

Girvasite Mineral Data

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General Girvasite Information

Help on Chemical  Formula: Chemical Formula: NaCa2Mg3(PO4)2[PO2(OH)2](CO3)(OH)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 628.07 gm
   Sodium       3.66 %  Na    4.93 % Na2O
   Calcium     12.76 %  Ca   17.86 % CaO
   Magnesium   11.61 %  Mg   19.25 % MgO
   Phosphorus  14.79 %  P    33.90 % P2O5
   Hydrogen     1.77 %  H    15.78 % H2O
   Carbon       1.91 %  C     7.01 % CO2
   Oxygen      53.50 %  O
              ______        ______ 
              100.00 %       98.73 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCa2Mg3(PO4)2(PO3OH)(CO3)(OH)2•4(H2O)
Help on Environment: Environment: Low-temperature hydrothermal mineral filling solution cavities in dolomite carbonatite in a differentiated alkaline massif.
Help on IMA Status: IMA Status: Approved IMA 1990
Help on Locality: Locality: Zheleznyi iron mine, Kovdor massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lake Girvas, northwest of the Kovdor massif, Kola Peninsula, Russia.
Help on Name Pronunciation: Name Pronunciation: Girvasite + Pronunciation Say GIRVASITE
Help on Synonym: Synonym: ICSD 39339
  PDF 42-1397

Girvasite Image

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Comments: Translucent aggregate of girvasite.
Location: Kovdor Mine, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Girvasite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5304:1:1.7447
Help on Cell Dimensions: Cell Dimensions: a = 6.507, b = 12.267, c = 21.403, Z = 4; beta = 90.37° V = 1,708.38 Den(Calc)= 2.44
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.72(1), 3.57(0.8), 2.016(0.35),

Physical Properties of Girvasite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.46
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white

Optical Properties of Girvasite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2272,KPDmeas= 0.2253,KC= 0.2158
Ncalc = 1.53
Help on Optical Data: Optical Data: Biaxial (-), a=1.541, b=1.557, g=1.565, bire=0.0240, 2V(Calc)=68, 2V(Meas)=60-71.

Calculated Properties of Girvasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.48 gm/cc
note: Specific Gravity of Girvasite =2.46 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGirvasite = 2.64 barns/electron
U=PEGirvasite x rElectron Density= 6.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Girvasite is Not Radioactive

Girvasite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.05.17)Dana Group Girvasite NaCa2Mg3(PO4)2[PO2(OH)2](CO3)(OH)2•4(H2O) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.DO.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DO -With CO3, SO4, SiO4
08.DO.05 Girvasite NaCa2Mg3(PO4)2[PO2(OH)2](CO3)(OH)2•4(H2O) P 21/c 2/m

Other Girvasite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.76,p667,1991) OPTIC PROP.(Am.Min.,Vol.76,p667,1991)
Help on See Also: See Also: Links to other databases for Girvasite :
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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Dana No: Strunz No: 08.DO.05





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