Carboborite Mineral Data

Carboborite Mineral Data

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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)

IMA Status:

Approved IMA 1964

Locality:

NONE Link to MinDat.org Location Data.

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 - PrismaticH-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),

Crystal Structure:

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Zhesheng M , Nicheng S , Jinchuan S , Zhizhong P , Bulletin de Mineralogie , 104 (1981) p.578-581, The refinement of the crystal structure of carboborite MgCa2[CO3]2[B(OH)4]2*4H2O

Physical Properties of Carboborite

Color:

Colorless.

Density:

2.12

Diaphaniety:

Transparent

Hardness:

2 - Gypsum

Luminescence:

Fluorescent.

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

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:

r_electron=2.22 gm/cc
note: r_Carboborite=2.15 gm/cc.

Fermion Index

Fermion Index = 0.01595
Boson Index = 0.98405

Photoelectric:

PE_Carboborite= 2.45 barns/electron
U=PE_Carboborite x r_electron= 5.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Carboborite is Not Radioactive

Carboborite Classification

Dana Class:

27.1.1.1 (27)Compound Borates

(27.1)Dana Type

(27.1.1)Dana Group

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

Strunz Class:

V/G.10-30 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 Carboborite Information

References:

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

Carboborite

Ca2Mg(CO3)2B2(OH)8·4(H2O)
Dana No: 27.1.1.1 Strunz No: V/G.10-30
Locality:

Notes: