Carboborite Mineral Data

General Carboborite Information

Chemical Formula:

Ca2Mg(CO3)2B2(OH)8•4(H2O)

Composition:

Molecular Weight = 454.22 gm

Calcium 17.65 % Ca 24.69 % CaO

Magnesium 5.35 % Mg 8.87 % MgO

Boron 4.76 % B 15.33 % B₂O₃

Hydrogen 3.55 % H 31.73 % H₂O

Carbon 5.29 % C 19.38 % CO₂

Oxygen 63.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mg(CO₃)₂B₂(OH)₈•4(H₂O)

Environment:

Lacustrine borate deposit.

IMA Status:

Approved IMA 1964

Locality:

China, at an unspecified locality [Dafangshan, Qinghai Plateau, Tibet]. Link to MinDat.org Location Data.

Name Origin:

Named for the essential anionic chemical components, CARBOnate and BORate.

Synonym:

ICSD 64685

PDF 17-529

Carboborite Image

Images:

Carboborite

Comments: Pure crystalline cleavage fragment of carboborite.
Location: Inlamartit, Turkey. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Carboborite Crystallography

Axial Ratios:

a:b:c =2.7829:1:1.6946

Cell Dimensions:

a = 18.59, b = 6.68, c = 11.32, Z = 4; beta = 91.683° V = 1,405.12 Den(Calc)= 2.15

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 4.315(1), 5.63(1), 3.136(0.8),

Physical Properties of Carboborite

Color:

Colorless.

Density:

2.12

Diaphaneity:

Transparent

Hardness:

2 - Gypsum

Luminescence:

Fluorescent, Short UV=white, Long UV=white.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Carboborite

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2515,KPDmeas= 0.255,KC= 0.2513
Ncalc = 1.53 - 1.54

Optical Data:

Biaxial (-), a=1.5069, b=1.5459, g=1.5693, bire=0.0624

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Carboborite

Electron Density:

Bulk Density (Electron Density)=2.22 gm/cc
note: Specific Gravity of Carboborite =2.15 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Carboborite= 2.45 barns/electron
U=PE_Carboborite x rElectron Density= 5.42 barns/cc.

Radioactivity:

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

Carboborite Classification

Dana Class:

27.01.01.01 (27)Compound Borates

(27.01)Dana Type

(27.01.01)Dana Group

27.01.01.01 Carboborite Ca2Mg(CO3)2B2(OH)8•4(H2O) P 2₁/n 2/m

Strunz Class:

06.AC.50 06 - BORATES

06.A - Monoborates

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

06.AC.50 Carboborite Ca2Mg(CO3)2B2(OH)8•4(H2O) P 2₁/n 2/m

Other Carboborite 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 Carboborite :
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 Carboborite Specimen Label here :

Carboborite

Ca2Mg(CO3)2B2(OH)8•4(H2O)
Dana No: 27.01.01.01 Strunz No: 06.AC.50
Locality:

Notes:

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