Terskite Mineral Data + 
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- 78.7.15.1 Terskite Na4Zr(H4Si6O18) Pnc2 mm2
- VIII/F.23-10 Elpidite Na2ZrSi6O15·3(H2O) Pb21m mm2
- VIII/F.23-20 Terskite Na4Zr(H4Si6O18) Pnc2 mm2
General Terskite Information |
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 Chemical Formula: |
Na4Zr(H4Si6O18) | ||
| Composition: |
Molecular Weight = 643.72 gm | ||
| Sodium 14.29 % Na 19.26 % Na2O | |||
| Zirconium 14.17 % Zr 19.14 % ZrO2 | |||
| Silicon 26.18 % Si 56.00 % SiO2 | |||
| Hydrogen 0.63 % H 5.60 % H2O | |||
| Oxygen 44.74 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Na4ZrH4Si6O18 | ||
| IMA Status: |
Approved IMA 1983 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Synonym: |
ICSD 39454 | ||
| PDF 35-712 | |||
Terskite Image | |||
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Images:
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Terskite Crystallography |
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| Axial Ratios: |
a:b:c =0.9623:1:0.5092 | ||
| Cell Dimensions: |
a = 14.195, b = 14.75, c = 7.511, Z = 4; V = 1,572.63 Den(Calc)= 2.72 | ||
| Crystal System: |
Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pnc2 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.257(1), 3.299(1), 3.324(1), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Terskite |
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| Color: |
White, Light lilac. | ||
| Density: |
2.71 | ||
| Hardness: |
5 - Apatite | ||
| Luminescence: |
Fluorescent. | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Terskite |
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| Gladstone-Dale: |
CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2135,KPDmeas= 0.2143,KC= 0.2125 |
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| Optical Data: |
Biaxial (-), a=1.576, b=1.582, g=1.584, bire=0.0080 | ||
| Pleochroism (x): |
colorless. | ||
| Pleochroism (y): |
colorless. | ||
| Pleochroism (z): |
colorless. | ||
Calculated Properties of Terskite |
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| Electron Density: |
relectron=2.67 gm/cc |
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| Fermion Index |
Fermion Index = 0.02834 Boson Index = 0.97166 |
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| Photoelectric: |
PETerskite = 19.81 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Terskite is Not Radioactive |
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Terskite Classification |
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| Dana Class: |
78.7.15.1 (78)Unclassified silicates | ||
| (78.7)wholly unclassified silicates | |||
| (78.7.15)Dana Group | |||
| Strunz Class: |
VIII/F.23-20 VIII - Silicates | ||
| VIII/F - Inosilicates (chain and band) Triplet chains [Si6O15/17]6-/10- and modified triplet bands | |||
| VIII/F.23 - Elpidite - Terskite series | |||
Other Terskite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Terskite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris Search for Terskite using: Visit our Advertisers for Terskite : AA Mineral SpecimensB & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Terskite Mineral Data : Ask about Terskite here : Print or Cut-and-Paste your Terskite Specimen Label here :
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