Mineralogy Database

Gregoryite Mineral Data

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General Gregoryite Information

Help on Chemical  Formula: Chemical Formula: (Na2,K2,Ca)CO3
Help on Composition: Composition: Molecular Weight = 115.06 gm
   Potassium  20.39 %  K    24.56 % K2O
   Sodium     23.98 %  Na   32.32 % Na2O
   Calcium     3.48 %  Ca    4.87 % CaO
   Carbon     10.44 %  C    38.25 % CO2
   Oxygen     41.71 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: 0.6(Na2)0.3(K2)Ca0.1(CO3)
Help on Environment: Environment: Phenocrysts in lengaite carbonatite lava.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Oldoinyo Lengai volcano, Tanzania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Walter Gregory (1864-1932), University of Melbourne, Melbourne, Australia and University of Glasgow, Glasgow, Scotland.
Help on Name Pronunciation: Name Pronunciation: Gregoryite + Pronunciation Say GREGORYITE

Gregoryite Image

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  Nyerereite   Gregoryite

Comments: Sodium (nyereteite) and potassium (gregoryite) carbonates, not stable in normal atmosphere, collected molten from the volcano and maintained in inert argon atmosphere.
Location: Ol Doinyo Lengai Vulkan, Maasai Steppe, East Africa Rift Valley, Tanzania. See Link. Scale: Rock size 2 cm.
© Richard Dale / Dale Minerals

Gregoryite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.26251
Help on Cell Dimensions: Cell Dimensions: a = 5.215, c = 6.584, Z = 2; V = 155.07 Den(Calc)= 2.46
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Pyramidal H-M Symbol (6mm) Space Group: P 63mc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.66(1), 2.61(0.75), 3.29(0.4),

Physical Properties of Gregoryite

Help on Color: Color: White.
Help on Density: Density: 2.27
Help on Streak: Streak: white

Optical Properties of Gregoryite

Help on Optical Data: Optical Data: NCalc= 1.49 - from Gladstone-Dale relationship (KC = 0.2005) where Ncalc=Dcalc*KC+1
NCalc= 1.46 - from Gladstone-Dale relationship (KC = 0.2005) where Ncalc=Dmeas*KC+1

Calculated Properties of Gregoryite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.42 gm/cc
note: Specific Gravity of Gregoryite =2.46 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.001419959
Boson Index = 0.998580041
Help on Photoelectric: Photoelectric: PEGregoryite = 2.98 barns/electron
U=PEGregoryite x relectron= 7.21 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 289.43 (Gamma Ray American Petroleum Institute Units)
Concentration of Gregoryite per GRapi unit = 0.35 (%)

Estimated Radioactivity from Gregoryite - barely detectable


Gregoryite Classification

Help on  Dana Class: Dana Class: (14)Anhydrous Carbonates
  (14.01)with Simple Formula A+ CO3
  (14.01.02)Vaterite Group Vaterite CaCO3 P 63/mmc 6/m 2/m 2/m Gregoryite (Na2,K2,Ca)CO3 P 63mc 6mm
Help on  Strunz Class: Strunz Class: 05.AA.10 05 - CARBONATES (NITRATES)
  05.A - Carbonates without additional anions, without H2O
  05.AA -Alkali Carbonates
05.AA.10 Gregoryite (Na2,K2,Ca)CO3 P 63mc 6mm
05.AA.10 Natrite Na2CO3 C 2 or Cm Mono

Other Gregoryite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Gregoryite :
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: 05.AA.10





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