Tyretskite Mineral Data

General Tyretskite Information

Chemical Formula:

Ca2B5O9(OH)•(H2O)

Composition:

Molecular Weight = 313.22 gm

Calcium 25.59 % Ca 35.81 % CaO

Boron 17.26 % B 55.57 % B₂O₃

Hydrogen 0.97 % H 8.63 % H₂O

Oxygen 56.19 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂B₅O₉(OH)•(H₂O)

Environment:

Cavity in dolomitic saline rock, in drillcore from a depth of 1233 m.

IMA Status:

Approved IMA 1964

Locality:

Tyret railway station, on the east Siberian railway, in the Lena-Angara salt basin, Irkutsk district, Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Tyretskite + Pronunciation

Tyretskite Image

Images:

Tyretskite

Comments: Gray granular tyretskite coating.
Location: Kazakhstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tyretskite Crystallography

Axial Ratios:

a:b:c =0.9737:1:1.0139

Cell Dimensions:

a = 6.3, b = 6.47, c = 6.56, Z = 1; alpha = 74.27°, beta = 61.6°, gamma = 61.25° V = 198.49 Den(Calc)= 2.62

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

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

By Intensity(I/I_o): 2.86(1), 2.93(1), 2.14(0.9),

Physical Properties of Tyretskite

Color:

Brownish, Brownish white, White.

Density:

2.189

Diaphaneity:

Transparent

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tyretskite

Gladstone-Dale:

CI meas= -0.33 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.151 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2578,KPDmeas= 0.298,KC= 0.224
Ncalc = 1.49 - 1.57

Optical Data:

Biaxial (+), a=1.637, b=1.65, g=1.67, bire=0.0330, 2V(Calc)=80, 2V(Meas)=46.

Calculated Properties of Tyretskite

Electron Density:

Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Tyretskite =2.53 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Tyretskite= 3.36 barns/electron
U=PE_Tyretskite x rElectron Density= 8.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tyretskite is Not Radioactive

Tyretskite Classification

Dana Class:

26.05.15.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.15)Dana Group

26.05.15.01 Tyretskite Ca2B5O9(OH)•(H2O) P1 1

Strunz Class:

06.ED.05 06 - BORATES

06.E - Pentaborates

06.ED -Tecto-pentaborates

06.ED.05 Hilgardite Ca2B5O9Cl•(H2O) P1 1

06.ED.05 Tyretskite Ca2B5O9(OH)•(H2O) P1 1

06.ED.05 Kurgantaite! CaSr[B5O9]Cl•(H2O) P1 1

06.ED.05 IMA2007-047! Pb2[B5O9]Cl•0.5H2O Pnn2 mm2

Other Tyretskite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Tyretskite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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

Tyretskite

Ca2B5O9(OH)•(H2O)
Dana No: 26.05.15.01 Strunz No: 06.ED.05
Locality:

Notes: