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Girvasite

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About GirvasiteHide

Formula:
NaCa2Mg3(PO4)3(CO3)(H2O)6
Colour:
Creamy white, colorless
Lustre:
Vitreous, Silky
Hardness:
Specific Gravity:
2.46(2)
Crystal System:
Monoclinic
Name:
Named by S.N. Britvin, Y.A. Pakhomovskiy, A.N. Bogdanova, and Y.V. Sokolova in 1990 for Lake Girvas, northwest of the Kovdor massif, Kola Peninsula, Russia.
This page provides mineralogical data about Girvasite.


Classification of GirvasiteHide

Approved
First Published:
1990
8.DO.05

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
O : With CO3, SO4, SiO4
43.5.17.1

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
22.4.7

22 : Phosphates, Arsenates or Vanadates with other Anions
4 : Phosphates, arsenates or vanadates with carbonate

Physical Properties of GirvasiteHide

Vitreous, Silky
Transparency:
Transparent
Comment:
Silky for spherulites, vitreous for single crystals
Colour:
Creamy white, colorless
Comment:
Spherulites creamy white; single crystals colorless
Streak:
White
Hardness:
3½ on Mohs scale
Tenacity:
Very brittle
Cleavage:
Perfect
{001}
Density:
2.46(2) g/cm3 (Measured)    2.529(5) g/cm3 (Calculated)
Comment:
Measured in heavy liquids

Optical Data of GirvasiteHide

Type:
Biaxial (-)
RI values:
nα = 1.541 nβ = 1.557 nγ = 1.565
2V:
Measured: 60° to 71°, Calculated: 68°
Max Birefringence:
δ = 0.024
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
weak

Chemical Properties of GirvasiteHide

Formula:
NaCa2Mg3(PO4)3(CO3)(H2O)6
IMA Formula:
NaCa2Mg3(PO4)2[PO2(OH)2](CO3)(OH)2 · 4H2O

Crystallography of GirvasiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 6.4784(2) Å, b = 12.2313(3) Å, c = 21.3494(6) Å
β = 89.624(2)°
Ratio:
a:b:c = 0.53 : 1 : 1.745
Unit Cell V:
1,691.67 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals elongate [100] and up to 1 mm long and 0.07 mm across.

Type Occurrence of GirvasiteHide

General Appearance of Type Material:
Creamy white spherulites, rarely single prismatic crystals.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, 5948.
Mining Institute, St. Petersburg, 2025/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 87981.
Associated Minerals at Type Locality:

Synonyms of GirvasiteHide

Other Language Names for GirvasiteHide

German:Girvasit
Spanish:Girvasita

Related Minerals - Nickel-Strunz GroupingHide

8.DO.10VoggiteNa2Zr(PO4)(CO3)(OH) · 2H2OMon.
8.DO.15PeisleyiteNa2Al9[(P,S)O4]8(OH)6•28H2OTric. 1 : P1
8.DO.20PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2OTrig. 3m (3 2/m) : P3m1
8.DO.20KrásnoiteCa3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2OTrig. 3m (3 2/m) : P3m1
8.DO.25Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2OTet. 4 2 2
8.DO.30Micheelsenite(Ca,Y)3Al(HPO4,CO3)(CO3)(OH)6 · 12H2OHex.
8.DO.40Parwanite(Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7 · 30H2OMon. 2 : P2
8.DO.45SkorpioniteCa3Zn2(PO4)2(CO3)(OH)2 · H2OMon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.4.1BradleyiteNa3Mg(CO3)(PO4)Mon.
22.4.2KovdorskiteMg2(PO4)(OH) · 3H2OMon.
22.4.3Carbonate-rich HydroxylapatiteCa5(PO4,CO3)3(OH,O)Hex.
22.4.4Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)Hex.
22.4.5TyroliteCa2Cu9(AsO4)4(CO3)(OH)8 · 11H2OMon. 2/m
22.4.6HeneuiteCaMg5(CO3)(PO4)3(OH)Tric. 1 : P1
22.4.8Daqingshanite-(Ce)(Sr,Ca,Ba)3(Ce,La)(CO3)3-x(PO4)(OH,F)2xTrig.
22.4.9GartrellitePbCuFe3+(AsO4)2(OH) · H2OTric. 1 : P1
22.4.10VoggiteNa2Zr(PO4)(CO3)(OH) · 2H2OMon.
22.4.11BonshtedtiteNa3Fe2+(CO3)(PO4)Mon. 2/m : P21/m

Fluorescence of GirvasiteHide

Other InformationHide

IR Spectrum:
Absorption features in the infrared spectrum are at 3450, 3200, 1640, 1520, 1435, 1110, 1090, 1035,980, 880, 750, 715, 635, 615, 600, 575, and 560 cm-1.
Thermal Behaviour:
There is a strong endothermic peak at 370 °C and a weak one at 580°C, the first corresponding to loss of H20, which is also lost at 700-750°C. C02 is gradually lost between 400 and 1000°C.
Notes:
Readily soluble in cold 10% HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for GirvasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Britvin, S.N., Pakhomovskiy, Y.A., Bogdanova, A.N., Sokolova, Y.V. (1990) Girvasite - A new carbonate-phosphate of sodium, calcium and magnesium from carbonates of the Kovdor massif. Mineralogiceskij Zhurnal: 12: 79-83.
Sokolova, E.V., Egorov-Tismenko, Y.K. (1990) Crystal structure of girvasite. Soviet Physics - Doklady: 35: 308-310.
Sokolova, E.V., Yegorov-Tismenko, Y.K. (1990) Crystal structure of girvasite. Doklady Akademii Nauk SSSR: 331: 1372-1376.
Jambor, J.L., Puziewicz, J. (1991) New mineral names. American Mineralogist: 76: 665-671.
Jambor, J.L., Grew, E.S. (1992) New mineral names. American Mineralogist: 77: 207-213.
Mandarino, J.A. (1997) (1997) New Minerals 1990-1994. Tucson, Arizona, The Mineralogical Record Inc., 220 pp.
Krivovichev, S.V., Chernyatieva, A.P., Britvin, S.N., Yakovenchuk, V.N. (2015): The crystal structure of girvasite, NaCa2Mg3(PO4)3(CO3)(H2O)6, a complex phosphate-carbonate hydrate based upon electroneutral heteropolyhedral layers. Russian Geology and Geophysics 56, 155-163.

Internet Links for GirvasiteHide

Localities for GirvasiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Chile
 
  • Antofagasta
    • Antofagasta Province
      • Mejillones
        • Mejillones peninsula
XRD by Joachim Lorenz SEM-EDS by Joy Desor
Russia (TL)
 
  • Murmansk Oblast
    • Kovdor Massif
[World of Stones 95:5-6, p64]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mikhailova, J. A., Kalashnikov, A. O., Sokharev, V. A., Pakhomovsky, Y. A., Konopleva, N. G., Yakovenchuk, V. N., ... & Ivanyuk, G. Y. (2016). 3D mineralogical mapping of the Kovdor phoscorite–carbonatite complex (Russia). Mineralium Deposita, 51(1), 131-149.
 
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