Sakhaite Mineral Data

Sakhaite Mineral Data +

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General Sakhaite Information

Chemical Formula:

Ca3Mg(BO3)2(CO3)·0.36(H2O)

Composition:

Molecular Weight = 328.65 gm

Calcium 36.58 % Ca 51.19 % CaO

Magnesium 7.40 % Mg 12.26 % MgO

Boron 6.58 % B 21.18 % B₂O₃

Hydrogen 0.22 % H 1.97 % H₂O

Carbon 3.65 % C 13.39 % CO₂

Oxygen 45.57 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Mg(BO₃)₂(CO₃)·0.36(H₂O)

Environment:

In a skarn.

IMA Status:

Approved IMA 1966

Locality:

Solongo, Transbaikalia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality, Sakha being the name for Siberia in the Yakut language.

Synonym:

ICSD 20203

PDF 19-1112

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Sakhaite Crystallography

Cell Dimensions:

a = 14.685, Z = 16; V = 3,166.81 Den(Calc)= 2.76

Crystal System:

Isometric - GyroidalH-M Symbol (4 3 2) Space Group: F 4₁32

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

By Intensity(I/I_o): 2.58(1), 2.108(0.56), 5.16(0.22),

Crystal Structure:

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Yakubovich O V , Egorov-Tismenko Yu K , Simonov M A , Belov N V , Doklady Akademii Nauk SSSR , 239 (1978) p.1103-1106, Crystal structure of natural sakhaite Ca3Mg[BO3]2[CO3]*0.36H2O

Physical Properties of Sakhaite

Cleavage:

None

Color:

Colorless, Gray, Gray white.

Density:

2.78 - 2.83, Average = 2.8

Diaphaniety:

Transparent to Translucent

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Sakhaite

Gladstone-Dale:

CI meas= -0.079 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.096 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.233,KPDmeas= 0.2292,KC= 0.2125

Optical Data:

Isotropic, n=1.638-1.648.

Calculated Properties of Sakhaite

Electron Density:

r_electron=2.79 gm/cc
note: r_Sakhaite=2.81 gm/cc.

Fermion Index

Fermion Index = 0.0216
Boson Index = 0.9784

Photoelectric:

PE_Sakhaite= 4.78 barns/electron
U=PE_Sakhaite x r_electron= 13.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sakhaite is Not Radioactive

Sakhaite Classification

Dana Class:

27.1.4.1 (27)Compound Borates

(27.1)Dana Type

(27.1.4)Dana Group

27.1.4.1 Sakhaite Ca3Mg(BO3)2(CO3)·0.36(H2O) F 4₁32 4 3 2

Strunz Class:

V/G.06-50 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO3]3- "inseln"

V/G.06 - Berborite - Qilianshanite series

V/G.06-10 Berborite Be2(BO3)(OH,F)·(H2O) P 6₃ 6

V/G.06-20 Wightmanite Mg5(BO3)O(OH)5·2(H2O) I2/m 2/m

V/G.06-30 Shabynite Mg5(BO3)Cl2(OH)5·4(H2O) Unk. Mono

V/G.06-40 Canavesite Mg2(CO3)(HBO3)·5(H2O) P 2/m 2/m

V/G.06-50 Sakhaite Ca3Mg(BO3)2(CO3)·0.36(H2O) F 4₁32 4 3 2

V/G.06-60 Qilianshanite NaH4(CO3)(BO3)·2(H2O) C 2 2

Other Sakhaite Information

References:

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

See Also:

Links to other databases for Sakhaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Sakhaite

Ca3Mg(BO3)2(CO3)·0.36(H2O)
Dana No: 27.1.4.1 Strunz No: V/G.06-50
Locality:

Notes: