Hexahydroborite Mineral Data

General Hexahydroborite Information

Chemical Formula:

Ca[B(OH)4]2•2(H2O)

Composition:

Molecular Weight = 233.79 gm

Calcium 17.14 % Ca 23.99 % CaO

Boron 9.25 % B 29.78 % B₂O₃

Hydrogen 5.17 % H 46.24 % H₂O

Oxygen 68.44 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaB₂(OH)₈•2(H₂O)

IMA Status:

Approved IMA 1976

Locality:

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

Name Origin:

Named for the composition.

Name Pronunciation:

Hexahydroborite + Pronunciation

Synonym:

ICSD 23016

PDF 30-236

Hexahydroborite Image

Images:

Hexahydroborite

Comments: White to translucent hexahydroborite.
Location: Solongo B deposit, Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Hexahydroborite Crystallography

Axial Ratios:

a:b:c =1.204:1:1.2049

Cell Dimensions:

a = 8.006, b = 6.649, c = 8.012, Z = 2; beta = 104.21° V = 413.44 Den(Calc)= 1.88

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a

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

By Intensity(I/I_o): 7.73(1), 3.118(0.9), 3.37(0.9),

Physical Properties of Hexahydroborite

Cleavage:

None

Color:

Colorless, White.

Density:

1.87

Diaphaneity:

Transparent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Hexahydroborite

Gladstone-Dale:

CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2679,KPDmeas= 0.2693,KC= 0.2716
Ncalc = 1.51

Optical Data:

Biaxial (+), a=1.498, b=1.503, g=1.51, bire=0.0120, 2V(Calc)=82, 2V(Meas)=83.

Calculated Properties of Hexahydroborite

Electron Density:

Bulk Density (Electron Density)=1.95 gm/cc
note: Specific Gravity of Hexahydroborite =1.87 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Hexahydroborite}= 2.28 barns/electron
U=PE_{Hexahydroborite} x rElectron Density= 4.44 barns/cc.

Radioactivity:

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

Hexahydroborite Classification

Dana Class:

26.01.04.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.01)Dana Type

(26.01.04)Dana Group

26.01.04.01 Hexahydroborite Ca[B(OH)4]2•2(H2O) P 2/a 2/m

Strunz Class:

06.AC.25 06 - BORATES

06.A - Monoborates

06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.

06.AC.25 Hexahydroborite Ca[B(OH)4]2•2(H2O) P 2/a 2/m

Other Hexahydroborite 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 Hexahydroborite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Hexahydroborite

Ca[B(OH)4]2•2(H2O)
Dana No: 26.01.04.01 Strunz No: 06.AC.25
Locality:

Notes:

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