Metaborite Mineral Data

General Metaborite Information

Chemical Formula:

HBO2

Composition:

Molecular Weight = 43.82 gm

Boron 24.67 % B 79.44 % B₂O₃

Hydrogen 2.30 % H 20.56 % H₂O

Oxygen 73.03 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

HBO₂

Environment:

Fne-grained halite in a salt dome.

IMA Status:

Approved IMA 1964

Locality:

Chelkar salt dome, Ak-sa?I Valley, Uralsk district, and at the Inder borate deposit, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek meta, as a lesser hydrate than orthoboric acid.

Name Pronunciation:

Metaborite + Pronunciation

Synonym:

ICSD 34639

PDF 15-868

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Metaborite Crystallography

Cell Dimensions:

a = 8.89, Z = 24; V = 702.60 Den(Calc)= 2.49

Crystal System:

Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: P 43m

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

By Intensity(I/I_o): 4.442(1), 1.939(0.95), 3.627(0.5),

Physical Properties of Metaborite

Cleavage:

{???} Indistinct

Color:

Brownish, Brownish white, Colorless.

Density:

2.47

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Metaborite

Gladstone-Dale:

CI meas= -0.039 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2482,KPDmeas= 0.2502,KC= 0.2407
Ncalc = 1.59 - 1.6

Optical Data:

Isotropic, n=1.618.

Calculated Properties of Metaborite

Electron Density:

Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Metaborite =2.49 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Metaborite= 0.34 barns/electron
U=PE_Metaborite x rElectron Density= 0.86 barns/cc.

Radioactivity:

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

Metaborite Classification

Dana Class:

24.05.01.01 (24)Borates - Anhydrous

(24.05)with miscellaneous formulae

(24.05.01)Dana Group

24.05.01.01 Metaborite HBO2 P 43m 4 3m

Strunz Class:

06.GD.10 06 - BORATES

06.G - Heptaborates and other Megaborates

06.GD -Mega-tektoborates

06.GD.10 Metaborite HBO2 P 43m 4 3m

Other Metaborite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Metaborite :
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

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

Metaborite

HBO2
Dana No: 24.05.01.01 Strunz No: 06.GD.10
Locality:

Notes: