Terskite Mineral Data

Terskite Mineral Data +

General Terskite Information

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

Images:

Terskite

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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.257(1), 3.299(1), 3.324(1),

Crystal Structure:

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Pudovkina Z V , Chernitsova N M , Doklady Akademii Nauk SSSR , 316 (1991) p.645-649, Crystal structure of terskite Na4Zr[H4Si6O18]

Physical Properties of Terskite

Color:

White, Light lilac.

Density:

2.71

Hardness:

5 - Apatite

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Terskite

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

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

Electron Density:

r_electron=2.67 gm/cc
note: r_Terskite=2.72 gm/cc.

Fermion Index

Fermion Index = 0.02834
Boson Index = 0.97166

Photoelectric:

PE_Terskite= 19.81 barns/electron
U=PE_Terskite x r_electron= 52.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Terskite is Not Radioactive

Terskite Classification

Dana Class:

78.7.15.1 (78)Unclassified silicates

(78.7)wholly unclassified silicates

(78.7.15)Dana Group

78.7.15.1 Terskite Na4Zr(H4Si6O18) Pnc2 mm2

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

VIII/F.23-10 Elpidite Na2ZrSi6O15·3(H2O) Pb21m mm2

VIII/F.23-20 Terskite Na4Zr(H4Si6O18) Pnc2 mm2

Other Terskite Information

References:

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

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Print or Cut-and-Paste your Terskite Specimen Label here :

Terskite

Na4Zr(H4Si6O18)
Dana No: 78.7.15.1 Strunz No: VIII/F.23-20
Locality:

Notes: