Garrelsite-VIII Mineral Data

General Garrelsite-VIII Information

Chemical Formula:

Ba3NaSi2B7O16(OH)4

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

Empirical Formula:

Ba₃NaSi₂B₇O₁₆(OH)₄

Environment:

Of authigenic origin, in dolomitic shale in drill core from the Green River Formation.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

From several drill holes in Uintah Co., Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Robert Minard Garrels (1916-1988), American geochemist and educator.

Name Pronunciation:

Garrelsite-VIII + Pronunciation

Garrelsite-VIII Crystallography

Axial Ratios:

a:b:c =1.7291:1:1.5872

Cell Dimensions:

a = 14.639, b = 8.466, c = 13.438, Z = 4; beta = 114.21° V = 1,518.95 Den(Calc)= 3.90

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/I_o): 3.02(1), 2(0.9), 2.07(0.9),

Physical Properties of Garrelsite-VIII

Color:

Colorless.

Density:

3.68

Diaphaneity:

Transparent

Optical Properties of Garrelsite-VIII

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

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

Electron Density:

Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Garrelsite-VIII =3.68 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_{Garrelsite-VIII}= 203.78 barns/electron
U=PE_{Garrelsite-VIII} x rElectron Density= 683.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Garrelsite-VIII is Not Radioactive

Garrelsite-VIII Classification

Dana Class:

54.02.04.01 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.02)with B in [4] coordination

(54.02.04)Howlite and related species

54.02.04.01 Garrelsite-VIII Ba3NaSi2B7O16(OH)4 C 2/c 2/m

54.02.04.02 Jadarite! LiNaB3SiO7(OH) P 2₁/n 2/m

54.02.04.03 Okanoganite-(Y) (Na,Ca)3(Y,Ce)12Si6B2O27F14 R 3m 3m

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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Print or Cut-and-Paste your Garrelsite-VIII Specimen Label here :

Garrelsite-VIII

Ba3NaSi2B7O16(OH)4
Dana No: 54.02.04.01 Strunz No: 09.AJ.15
Locality:

Notes:

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