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Tarbagataite

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About TarbagataiteHide

Formula:
(K□)Ca(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)5
Colour:
brown to pale golden brown
Lustre:
Vitreous, Pearly
Hardness:
3
Specific Gravity:
3.263 (Calculated)
Crystal System:
Triclinic
Name:
The name is for the locality where the mineral was discovered: the Verkhnee Espe deposit is located in the northern part of the Tarbagatai mountain range in the Akjailyautas Mountains of Kazakhstan.
This page provides mineralogical data about Tarbagataite.


Classification of TarbagataiteHide

Approved
Approval Year:
2010

Physical Properties of TarbagataiteHide

Vitreous, Pearly
Transparency:
Transparent, Opaque
Colour:
brown to pale golden brown
Streak:
colorless with a hint of yellow
Hardness:
Tenacity:
Elastic
Cleavage:
Perfect
perfect cleavage parallel to {001} and moderate cleavage parallel to {010}
Density:
3.263 g/cm3 (Calculated)

Optical Data of TarbagataiteHide

Type:
Biaxial (+)
RI values:
nα = 1.710(3) nβ = 1.715(3) nγ = 1.745(3)
2V:
Measured: 37° (3), Calculated: 45°
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
not measured
Pleochroism:
Visible
Comments:
X < Z < Y, where X = yellow brown, Y = orange red, Z = yellow orange (λ 589 nm)

Chemical Properties of TarbagataiteHide

Formula:
(K□)Ca(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)5
IMA Formula:
(K◻)Ca(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)5

Crystallography of TarbagataiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.3868(3) Å, b = 11.9141(6) Å, c = 11.7171(6) Å
α = 112.978(2)°, β = 94.641(2)°, γ = 103.189(2)°
Ratio:
a:b:c = 0.452 : 1 : 0.983
Unit Cell V:
661.83 ų (Calculated from Unit Cell)
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.095 (80)
3.735 (30)
3.497 (50)
3.258 (100)
2.858 (80)
2.761 (70)
2.646 (30)
2.560 (50)

Type Occurrence of TarbagataiteHide

General Appearance of Type Material:
intimately associated with astrophyllite as lamellar intergrowths (Fig. 1) up to 10 × 3 × 0.2 mm
Place of Conservation of Type Material:
Geological Museum of the Satpaev Institute of Geological Sciences, ul. Kabanbai batyr, 69, Almaty, 050010, Kazakhstan, catalogue No. 3009/2010
Geological Setting of Type Material:
pegmatitic quartz-feldspar vein several hundred meters from outcrops of alkaline granite.
Associated Minerals at Type Locality:

Synonyms of TarbagataiteHide

Other Language Names for TarbagataiteHide

Relationship of Tarbagataite to other SpeciesHide

Other Members of this group:
AstrophylliteK2NaFe2+7Ti2Si8O28(OH)4FTric. 1 : P1
BulgakiteLi2(Ca,Na)Fe2+7Ti2(Si4O12)2O2(OH)4(F,O)(H2O)2Tric. 1 : P1
Hydroastrophyllite(H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31Tric.
NalivkiniteLi2Na(Fe2+,Mn2+)7Ti2Si8O26(OH)4FTric. 1 : P1
Niobophyllite(K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31Tric.
ZircophylliteK2NaFe2+7Zr2(Si4O12)2O2(OH)4FTric.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hydroastrophyllite3 photos of Tarbagataite associated with Hydroastrophyllite on mindat.org.
Quartz2 photos of Tarbagataite associated with Quartz on mindat.org.

Fluorescence of TarbagataiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TarbagataiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Stepanov, A.V., Bekenova, G.K., Levin, V.L., Sokolova, E. and Hawthorn, F.C. (2010) Tarbagataite, IMA 2010-048. CNMNC Newsletter No. 7, February 2010, page 28; Mineralogical Magazine, 75, 27-31.
Stepanov, A.V., Bekenova, G.K., Levin, V.L., Hawthorne, F.C. & Dobrovol’skaya, E.A. (2012): Tarbagataite,(K,□)2(Ca,Na)(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)4(OH,F), a new astrophyllite-group mineral species from the Verkhnee Espe deposit, Akjailyautas Mountains, Kazakhstan: description and crystal structure Canadian Mineralogist 50,159-168.

Internet Links for TarbagataiteHide

Localities for TarbagataiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Kazakhstan (TL)
 
  • East Kazakhstan
    • Tarbagatai Range
      • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
Stepanov, A.V., Bekenova, G.K., Levin, V.L., Sokolova, E. and Hawthorn, F.C. (2010) Tarbagataite, IMA 2010-048. CNMNC Newsletter No. 7, February 2010, page 28; Mineralogical Magazine, 75, 27-31.; STEPANOV, A.V., BEKENOVA, G.K., LEVIN, V.L., HAWTHORNE, F.C. & DOBROVOL’SKAYA, E.A. (2012): Tarbagataite,(K,□)2(Ca,Na)(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)4(OH,F), a new astrophyllite-group mineral species from the Verkhnee Espe deposit, Akjailyautas Mountains, Kazakhstan: description and crystal structure Canadian Mineralogist 50,159-168.
Mineral and/or Locality  
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