Buryatite Mineral Data

Buryatite Mineral Data

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General Buryatite Information

Chemical Formula:

Ca3(Si,Fe+++,Al)[SO4][B(OH)4](OH,O)6·12(H2O)

Composition:

Molecular Weight = 730.42 gm

Calcium 16.46 % Ca 23.03 % CaO

Aluminum 0.37 % Al 0.70 % Al₂O₃

Iron 1.53 % Fe 2.19 % Fe₂O₃

Silicon 2.31 % Si 4.94 % SiO₂

Boron 1.48 % B 4.77 % B₂O₃

Hydrogen 5.34 % H 47.73 % H₂O

Sulfur 4.39 % S 10.96 % SO₃

Oxygen 68.12 % O

______ ______

100.00 % 94.30 % = TOTAL OXIDE

Empirical Formula:

Ca₃Si_0.6Fe³⁺_0.2Al_0.1(SO₄)B(OH)_14.7O_0.4·12(H₂O)

Environment:

Found in a drill core of a kurchatovite-sakhaite ore in the Solongo deposit. Ettringite group

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Solongo boron deposit, Buryatiya, Ural Mts, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality

Synonym:

IMA2000-021

Buryatite Image

Images:

Buryatite

Comments: Vitreous colorless buryatite on matrix.
Location: Solongo B deposit, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Buryatite Crystallography

Axial Ratios:

a:c = 1:1.8842

Cell Dimensions:

a = 11.14, c = 20.99, Z = 4; V = 2,255.87 Den(Calc)= 2.15

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3₁c

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

By Intensity(I/I_o): 2.596(1)(312), 2.121(0.9)(136), 3.04(0.8),9.7(0.8)(100), 1.498(0.7)(248), 1.833(0.6)(332), 2.374(0.6)(134), 2.736(0.6)(304), 3.85(0.6),

Physical Properties of Buryatite

Cleavage:

[100] Perfect

Color:

Light violet gray.

Diaphaniety:

Translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Buryatite

Gladstone-Dale:

CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2453,KC= 0.2589

Optical Data:

Uniaxial (+), w=1.523, e=1.532, bire=0.0090.

Calculated Properties of Buryatite

Electron Density:

r_electron=2.26 gm/cc
note: r_Buryatite=2.15 gm/cc.

Fermion Index

Fermion Index = 0.00523
Boson Index = 0.99477

Photoelectric:

PE_Buryatite= 2.91 barns/electron
U=PE_Buryatite x r_electron= 6.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Buryatite is Not Radioactive

Buryatite Classification

Dana Class:

31.10.2.3 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.10)miscellaneous

(31.10.2)Dana Group

31.10.2.1 Ettringite Ca6Al2(SO4)3(OH)12·26(H2O) P 6₃/mmc 6/m 2/m 2/m

31.10.2.2 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12·26(H2O) P 6₃/mmc 6/m 2/m 2/m

31.10.2.3 Buryatite ! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6·12(H2O) P 3₁c 3m

Strunz Class:

VI/D.13-60 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.13 - Ettringite group, Ettringite - Sturmanite

VI/D.13-10 Ettringite Ca6Al2(SO4)3(OH)12·26(H2O) P 6₃/mmc 6/m 2/m 2/m

VI/D.13-20 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12·26(H2O) P 6₃/mmc 6/m 2/m 2/m

VI/D.13-30 Jouravskite Ca3Mn(SO4,CO3)2(OH)6·12(H2O) P 6₃/m 6/m

VI/D.13-35 Carraraite! Ca3Ge(OH)6(SO4)(CO3)·12H2O P 6₃/m, or P 6₃ Hex

VI/D.13-40 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12·26(H2O) P 3₁c 3m

VI/D.13-50 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12·25(H2O) P 3₁c 3m

VI/D.13-60 Buryatite Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6·12(H2O) P 3₁c 3m

Other Buryatite Information

References:

NAME( AmMin, Vol 87, p 1509) PHYS. PROP.(AmMin, Vol 87, p 1509) OPTIC PROP.(AmMin, Vol 87, p 1509)

See Also:

Links to other databases for Buryatite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Buryatite

Ca3(Si,Fe+++,Al)[SO4][B(OH)4](OH,O)6·12(H2O)
Dana No: 31.10.2.3 Strunz No: VI/D.13-60
Locality:

Notes: