Tienshanite Mineral Data

Tienshanite Mineral Data +

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General Tienshanite Information

Chemical Formula:

BaNa2MnTiB2Si6O20

Composition:

Molecular Weight = 796.25 gm

Barium 17.25 % Ba 19.26 % BaO

Sodium 5.77 % Na 7.78 % Na₂O

Titanium 6.01 % Ti 10.03 % TiO₂

Manganese 6.90 % Mn 8.91 % MnO

Silicon 21.16 % Si 45.28 % SiO₂

Boron 2.72 % B 8.74 % B₂O₃

Oxygen 40.19 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaNa₂Mn²⁺TiB₂Si₆O₂₀

Environment:

Pegmatite cutting alkalic syenite.

IMA Status:

Approved IMA 1967

Locality:

Dara-i-pioz massif, Tien Shan, southern Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 76913

PDF 20-1291

Tienshanite Image

Images:

Tienshanite Cesium-kupletskite

Comments: Dark olive-green colored crystalline tienshanite with cesium-kupletskite in microcline.
Location: Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tienshanite Crystallography

Axial Ratios:

a:c = 1:0.62216

Cell Dimensions:

a = 16.772, c = 10.435, Z = 6; V = 2,542.10 Den(Calc)= 3.12

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6/m

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

By Intensity(I/I_o): 4.19(1), 3.177(0.9), 3.474(0.8),

Crystal Structure:

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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 36 (1998) p.1305-1310, Refinement of the crystal structure of tienshanite: short-range-order, constraints on chemical composition

Physical Properties of Tienshanite

Cleavage:

[0001] Distinct

Color:

Pistachio green.

Density:

3.29

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Vitreous (Glassy)

Optical Properties of Tienshanite

Gladstone-Dale:

CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2114,KPDmeas= 0.2005,KC= 0.2094

Optical Data:

Uniaxial (-), e=1.653, w=1.666, bire=0.0130.

Calculated Properties of Tienshanite

Electron Density:

r_electron=2.97 gm/cc
note: r_Tienshanite=3.12 gm/cc.

Fermion Index

Fermion Index = 0.05399
Boson Index = 0.94601

Photoelectric:

PE_Tienshanite= 76.38 barns/electron
U=PE_Tienshanite x r_electron= 226.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tienshanite is Not Radioactive

Tienshanite Classification

Dana Class:

64.4.1.1 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups

(64.4)6-membered rings with [Si2O7] dimers

(64.4.1)Dana Group

64.4.1.1 Tienshanite BaNa2MnTiB2Si6O20 P 6/m 6/m

Strunz Class:

VIII/E.20-10 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.20 - Tienshanite - Traskite series

VIII/E.20-05 Odintsovite K2Na4Ca3Ti2Be4Si12O38 F ddd 2/m 2/m 2/m

VIII/E.20-10 Tienshanite BaNa2MnTiB2Si6O20 P 6/m 6/m

VIII/E.20-20 Traskite (Ba,Ca)9(Fe,Mn)2Ti2(SiO3)12(OH,Cl,F)6·6(H2O) P 6m2 6 m2

Other Tienshanite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Tienshanite

BaNa2MnTiB2Si6O20
Dana No: 64.4.1.1 Strunz No: VIII/E.20-10
Locality:

Notes: