Girvasite Mineral Data (original) (raw)

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

IMA1988-046

PDF 42-1397

Girvasite Image

Click Here for Larger Girvasite Image in a New Browser Window Images:

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 - PrismaticH-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),

Click Here for Large Girvasite Structure Window Crystal Structure:

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| | Sokolova E V , Yegorov-Tismenko Y K , Doklady Akademii Nauk SSSR , 331 (1990) p.1372-1376, Crystal structure of girvasite | | ---------------------------------------------------------------------------------------------------------------------------- |

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:

43.05.17.01 (43)Compound Phosphates, etc.

(43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.05.17)Dana Group

43.05.17.01 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
15 - WWW-MINCRYST

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Ask about Girvasite here :
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Print or Cut-and-Paste your Girvasite Specimen Label here :

Girvasite

NaCa2Mg3(PO4)2[PO2(OH)2](CO3)(OH)2•4(H2O)
Dana No: 43.05.17.01 Strunz No: 08.DO.05
Locality:

Notes: