Garrelsite-VIII Mineral Data

Garrelsite-VIII Mineral Data +

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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

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Link to MinDat.org Location Data.

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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 - PrismaticH-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

Diaphaniety:

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

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:

r_electron=3.35 gm/cc
note: r_{Garrelsite-VIII}=3.68 gm/cc.

Fermion Index

Fermion Index = 0.10244
Boson Index = 0.89756

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Garrelsite-VIII is Not Radioactive

Garrelsite-VIII Classification

Dana Class:

54.2.4.1 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.2)with B in [4] coordination

(54.2.4)Howlite and related species

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

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

Strunz Class:

VIII/B.32-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron

VIII/B.32 - Garrelsite series

VIII/B.32-10* Garrelsite-V Ba3NaSi2B7O16(OH)4 C 2/c 2/m

VIII/B.32-10 Garrelsite-VIII Ba3NaSi2B7O16(OH)4 C 2/c 2/m

Other Garrelsite-VIII Information

References:

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Garrelsite-VIII

Ba3NaSi2B7O16(OH)4
Dana No: 54.2.4.1 Strunz No: VIII/B.32-10
Locality:

Notes: