Hexahydroborite Mineral Data

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.

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 - PrismaticH-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

Diaphaniety:

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

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:

r_electron=1.95 gm/cc
note: r_{Hexahydroborite}=1.87 gm/cc.

Fermion Index

Fermion Index = 0.01897
Boson Index = 0.98103

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hexahydroborite is Not Radioactive

Hexahydroborite Classification

Dana Class:

26.1.4.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.1)Dana Type

(26.1.4)Dana Group

26.1.4.1 Hexahydroborite Ca[B(OH)4]2·2(H2O) P 2/a 2/m

Strunz Class:

V/G.10-20 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO4]5- tetraheders

V/G.10 - Olshanskyite - Carboborite series

V/G.10-10 Olshanskyite Ca2[B3O3(OH)6]OH·3(H2O) P1 1

V/G.10-20 Hexahydroborite Ca[B(OH)4]2·2(H2O) P 2/a 2/m

V/G.10-30 Carboborite Ca2Mg(CO3)2B2(OH)8·4(H2O) P 2₁/n 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 -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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Hexahydroborite

Ca[B(OH)4]2·2(H2O)
Dana No: 26.1.4.1 Strunz No: V/G.10-20
Locality:

Notes: