Hydroxylborite Mineral Data

General Hydroxylborite Information

Chemical Formula:

Mg3(BO3)(OH,F)3

Composition:

Molecular Weight = 185.25 gm

Magnesium 39.75 % Mg 65.92 % MgO

Boron 5.72 % B 18.41 % B₂O₃

Hydrogen 1.09 % H 9.72 % H₂O

Oxygen 43.18 % O

Fluorine 10.26 % F 10.26 % F

- % F -4.32 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_3.03B_0.98(OH)₂FO₃

Environment:

Occur in the mineralized marble adjacent to the boron ore (suanite-kotoite-ludwigite).. OH-dominant analogue of fluoborite.

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Titoskoe deposit, Chersky range, basin of the river Dogdo, Sakha Republic (Yakutia), Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the OH analogue of fluoborite.

Name Pronunciation:

Hydroxylborite + Pronunciation

Synonym:

IMA2005-054

Hydroxylborite Crystallography

Axial Ratios:

a:c = 1:0.34919

Cell Dimensions:

a = 8.912, c = 3.112, Z = 2; V = 214.05 Den(Calc)= 2.87

Crystal System:

Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P 6₃/m

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

By Intensity(I/I_o): 2.422(1), 4.45(0.82), 2.573(0.65),2.128(0.6), 7.69(0.52), 2.551(0.49), 2.141(0.44), 2.916(0.42),

Physical Properties of Hydroxylborite

Cleavage:

{0001} Imperfect

Color:

Colorless.

Density:

2.89

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

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

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Hydroxylborite

Gladstone-Dale:

CI meas= 0.093 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1911,KPDmeas= 0.1898,KC= 0.2093
Ncalc = 1.6

Optical Data:

Uniaxial (-), e=1.531, w=1.566, bire=0.0350.

Calculated Properties of Hydroxylborite

Electron Density:

Bulk Density (Electron Density)=2.86 gm/cc
note: Specific Gravity of Hydroxylborite =2.87 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_{Hydroxylborite}= 1.02 barns/electron
U=PE_{Hydroxylborite} x rElectron Density= 2.92 barns/cc.

Radioactivity:

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

Hydroxylborite Classification

Dana Class:

25.01.02.02 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.01)Dana Type

(25.01.02)Dana Group

25.01.02.01 Fluoborite Mg3(BO3)(F,OH)3 P 6₃/m 6/m

25.01.02.02 Hydroxylborite! Mg3(BO3)(OH,F)3 P 6₃/m 6/m

Strunz Class:

06.AB.50 06 - BORATES

06.A - Monoborates

06.AB -BO3, with additional anions; 1(D) + OH, etc.

06.AB.50 Fluoborite Mg3(BO3)(F,OH)3 P 6₃/m 6/m

06.AB.50 Hydroxylborite! Mg3(BO3)(OH,F)3 P 6₃/m 6/m

Other Hydroxylborite Information

References:

NAME( Geology of Ore Deposits, v49:710) PHYS. PROP.(Geology of Ore Deposits, v49:710) OPTIC PROP.(Geology of Ore Deposits, v49:710)

See Also:

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

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

Hydroxylborite

Mg3(BO3)(OH,F)3
Dana No: 25.01.02.02 Strunz No: 06.AB.50
Locality:

Notes:

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