Tienshanite
A valid IMA mineral species
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About Tienshanite
Darai-Pioz valley - the glacier moraine
Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
Formula:
KNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11
Colour:
Olive-green
Lustre:
Vitreous
Hardness:
6 - 6½
Specific Gravity:
3.29
Crystal System:
Hexagonal
Name:
Named after its discovery locality, Dara-i-Pioz, Tien Shan Mountains, Tajikistan.
This page provides mineralogical data about Tienshanite.
Unique Identifiers
Mindat ID:
3958
Long-form identifier:
mindat:1:1:3958:7
GUID
(UUID V4):
(UUID V4):
f15e22d3-a6c4-4488-9610-c9acdedbfe25
IMA Classification of Tienshanite
Approved
IMA Formula:
K(Na,K,◻)9Ca2Ba6Mn2+6Ti6B12Si36O114(O,OH,F)11
Approval year:
1967
First published:
1967
Classification of Tienshanite
9.CL.05
9 : SILICATES (Germanates)
C : Cyclosilicates
L : [Si6O18]12- branched 6-membered single rings
9 : SILICATES (Germanates)
C : Cyclosilicates
L : [Si6O18]12- branched 6-membered single rings
64.4.1.1
64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
4 : Rings with Other Anions and Insular Silicate Groups: 6-membered rings with [Si2O7] dimers
64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
4 : Rings with Other Anions and Insular Silicate Groups: 6-membered rings with [Si2O7] dimers
17.5.32
17 : Silicates Containing other Anions
5 : Borosilicates
17 : Silicates Containing other Anions
5 : Borosilicates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Tsh | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Tienshanite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Olive-green
Hardness:
6 - 6½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{001}
{001}
Density:
3.29 g/cm3 (Measured) 3.14 g/cm3 (Calculated)
Optical Data of Tienshanite
Type:
Uniaxial (-)
RI values:
nω = 1.666 nε = 1.653
Max Birefringence:
δ = 0.013
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Chemistry of Tienshanite
Mindat Formula:
KNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11
Elements listed:
Common Impurities:
Fe,Ta,Nb,Mg,Ca,K
Crystallography of Tienshanite
Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P6/m
Cell Parameters:
a = 16.785(2) Å, c = 10.454(1) Å
Ratio:
a:c = 1 : 0.623
Unit Cell V:
2550.7 ų
Z:
1
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005580 | Tienshanite | Cooper M A, Hawthorne F C (1998) Refinement of the crystal structure of tienshanite: short-range-order constraints on chemical composition The Canadian Mineralogist 36 1305-1310 | 1998 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.19 Å | (100) |
3.18 Å | (90) |
3.47 Å | (80) |
2.803 Å | (50) |
2.419 Å | (50) |
10.5 Å | (35) |
3.89 Å | (30) |
Comments:
Dara-i-Pioz Glacier, Tajikistan. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Tienshanite
General Appearance of Type Material:
Finely crystalline aggregates up to 5x6 cm in size. Sometimes replaced by datolite.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Moscow, Russia, numbers 70146, vis3329 (type).
Geological Setting of Type Material:
In a narrow vein of quartz-aegirine-microcline pegmatite, cutting alkali syenite.
Associated Minerals at Type Locality:
Synonyms of Tienshanite
Other Language Names for Tienshanite
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Tienshanite associated with Sogdianite | K◻2Zr2Li3[Si12O30] |
Other Information
Electrical:
Not piezo-electric.
Thermal Behaviour:
Fuses at 840°C.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Tienshanite
mindat.org URL:
https://www.mindat.org/min-3958.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Tienshanite
Reference List:
Localities for Tienshanite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Tajikistan (TL) | |
|
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Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan