Mineralogy Database

Garrelsite-VIII Mineral Data

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General Garrelsite-VIII Information

Help on Chemical  Formula: Chemical Formula: Ba3NaSi2B7O16(OH)4
Help on Composition: Composition: Molecular Weight = 890.83 gm
   Barium    46.25 %  Ba   51.63 % BaO
   Sodium     2.58 %  Na    3.48 % Na2O
   Silicon    6.31 %  Si   13.49 % SiO2
   Boron      8.49 %  B    27.35 % B2O3
   Hydrogen   0.45 %  H     4.04 % H2O
   Oxygen    35.92 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba3NaSi2B7O16(OH)4
Help on Environment: Environment: Of authigenic origin, in dolomitic shale in drill core from the Green River Formation.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1955
Help on Locality: Locality: From several drill holes in Uintah Co., Utah, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Robert Minard Garrels (1916-1988), American geochemist and educator.
Help on Name Pronunciation: Name Pronunciation: Garrelsite-VIII + Pronunciation Say GARRELSITE-VIII

Garrelsite-VIII Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7291:1:1.5872
Help on Cell Dimensions: Cell Dimensions: a = 14.639, b = 8.466, c = 13.438, Z = 4; beta = 114.21° V = 1,518.95 Den(Calc)= 3.90
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.02(1), 2(0.9), 2.07(0.9),

Physical Properties of Garrelsite-VIII

Help on Color: Color: Colorless.
Help on Density: Density: 3.68
Help on Diaphaneity: Diaphaneity: Transparent

Optical Properties of Garrelsite-VIII

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1618,KPDmeas= 0.1715,KC= 0.1733
Ncalc = 1.64 - 1.68
Help on Optical Data: Optical Data: Biaxial (-), a=1.62, b=1.633, g=1.64, bire=0.0200, 2V(Calc)=72, 2V(Meas)=72.

Calculated Properties of Garrelsite-VIII

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Garrelsite-VIII =3.68 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.1
Boson Index = 0.9
Help on Photoelectric: Photoelectric: PEGarrelsite-VIII = 203.78 barns/electron
U=PEGarrelsite-VIII x rElectron Density= 683.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Garrelsite-VIII is Not Radioactive

Garrelsite-VIII Classification

Help on  Dana Class: Dana Class: (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.02)with B in [4] coordination
  (54.02.04)Howlite and related species Garrelsite-VIII Ba3NaSi2B7O16(OH)4 C 2/c 2/m Jadarite! LiNaB3SiO7(OH) P 21/n 2/m Okanoganite-(Y) (Na,Ca)3(Y,Ce)12Si6B2O27F14 R 3m 3m
Help on  Strunz Class: Strunz Class: 09.AJ.15 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,
09.AJ.15 Garrelsite-VIII Ba3NaSi2B7O16(OH)4 C 2/c 2/m
09.AJ.15 Garrelsite-V Ba3NaSi2B7O16(OH)4 C 2/c 2/m

Other Garrelsite-VIII Information

Help on References: References: NAME( AntBidBlaNic2) 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 Garrelsite-VIII :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.AJ.15





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