[On-Line Catalogue] [On-Line Auctions] [eBay] [Contact Us] [Policies] We specialize in fine European and Asian Mineral Specimens Heliodor is based in Prague, Czech Republic General Garrelsite-VIII InformationBa3NaSi2B7O16(OH)4 |
Molecular Weight = 890.83 gm |
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Barium 46.25 % Ba 51.63 % BaO |
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Sodium 2.58 % Na 3.48 % Na2O |
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Silicon 6.31 % Si 13.49 % SiO2 |
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Boron 8.49 % B 27.35 % B2O3 |
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Hydrogen 0.45 % H 4.04 % H2O |
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Oxygen 35.92 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
Ba3NaSi2B7O16(OH)4 |
Of authigenic origin, in dolomitic shale in drill core from the Green River Formation. |
Valid Species (Pre-IMA) 1955 |
From several drill holes in Uintah Co., Utah, USA. Link to MinDat.org Location Data. |
Named for Robert Minard Garrels (1916-1988), American geochemist and educator. |
Garrelsite-VIII + Pronunciation |
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| | Garrelsite-VIII Crystallographya:b:c =1.7291:1:1.5872 |
a = 14.639, b = 8.466, c = 13.438, Z = 4; beta = 114.21° V = 1,518.95 Den(Calc)= 3.90 |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c |
By Intensity(I/Io): 3.02(1), 2(0.9), 2.07(0.9), |
| Physical Properties of Garrelsite-VIIIColorless. |
3.68 |
Transparent |
| Optical Properties of Garrelsite-VIIICI 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 Biaxial (-), a=1.62, b=1.633, g=1.64, bire=0.0200, 2V(Calc)=72, 2V(Meas)=72. |
| Calculated Properties of Garrelsite-VIIIBulk Density (Electron Density)=3.35 gm/cc |
note: Specific Gravity of Garrelsite-VIII =3.68 gm/cc. Fermion Index = 0.1 |
Boson Index = 0.9 PEGarrelsite-VIII = 203.78 barns/electron |
U=PEGarrelsite-VIII x rElectron Density= 683.55 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Garrelsite-VIII is Not Radioactive | Garrelsite-VIII Classification54.02.04.01 (54)Nesosilicate Borosilicates and Some Beryllosilicates |
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(54.02)with B in [4] coordination |
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(54.02.04)Howlite and related species |
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09.AJ.15 09 - SILICATES (Germanates) |
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09.A - Nesosilicates |
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09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, |
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| Other Garrelsite-VIII InformationNAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
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 10 - Ruff.Info Search for Garrelsite-VIII using: Visit our Advertisers for Garrelsite-VIII : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Garrelsite-VIII Mineral Data : Ask about Garrelsite-VIII here : Print or Cut-and-Paste your Garrelsite-VIII Specimen Label here :
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