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Terskite Mineral Data

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General Terskite Information

Help on Chemical  Formula: Chemical Formula: Na4ZrSi6O15(OH)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 646.98 gm
   Sodium     14.11 %  Na   19.02 % Na2O
   Zirconium  13.25 %  Zr   17.90 % ZrO2
   Manganese   0.34 %  Mn    0.44 % MnO
   Silicon    26.31 %  Si   56.28 % SiO2
   Hydrogen    0.71 %  H     6.38 % H2O
   Oxygen     45.28 %  O
             ______        ______ 
             100.00 %      100.01 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3.97Mn2+0.04Zr0.94Si6.06O16.02•2.29(H2O)
Help on Environment: Environment: In veins in pegmatites in alkalic massifs.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Mts. Alluaiv and Karnasurt, Lovozero massif, and on Mt. Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Tersk shore of the White Sea, southeastern Kola Peninsula, Russia.
Help on Name Pronunciation: Name Pronunciation: Terskite Say TERSKITE
Help on Synonym: Synonym: ICSD 39454
  PDF 35-712

Terskite Image

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Comments: Pale violet terskite fragment.
Location: Mount Rasvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Terskite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9623:1:0.5092
Help on Cell Dimensions: Cell Dimensions: a = 14.195, b = 14.75, c = 7.511, Z = 4; V = 1,572.63 Den(Calc)= 2.73
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Pnc2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.257(1), 3.299(1), 3.324(1),

Physical Properties of Terskite

Help on Color: Color: White, Light lilac.
Help on Density: Density: 2.71
Help on Habit: Habit: Pseudo Tetragonal - Crystals show a tetragonal shape.
Help on Hardness: Hardness: 5 - Apatite
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow-white, Long UV=yellow-white.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Terskite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2127,KPDmeas= 0.2143,KC= 0.2135
Ncalc = 1.58
Help on Optical Data: Optical Data: Biaxial (-), a=1.576, b=1.582, g=1.584, bire=0.0080
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Terskite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Terskite =2.73 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PETerskite = 18.67 barns/electron
U=PETerskite x rElectron Density= 50.12 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Terskite is Not Radioactive

Terskite Classification

Help on  Dana Class: Dana Class: (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.15)Dana Group Terskite Na4ZrSi6O15(OH)2•2(H2O) Pnc2 mm2
Help on  Strunz Class: Strunz Class: 09.DM.40 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DM -Inosilicates with 6-periodic single chains
09.DM.40 Terskite Na4ZrSi6O15(OH)2•2(H2O) Pnc2 mm2

Other Terskite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;www.saint-hilaire.ca) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 09.DM.40





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