Calciborite Mineral Data

Calciborite Mineral Data +

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General Calciborite Information

Chemical Formula:

CaB2O4

Composition:

Molecular Weight = 125.70 gm

Calcium 31.88 % Ca 44.61 % CaO

Boron 17.20 % B 55.39 % B₂O₃

Oxygen 50.91 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaB₂O₄

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 20097

PDF 27-67

Calciborite Image

Images:

Calciborite

Comments: Translucent colorless crystalline calciborite.
Location: Novofrolovskoye, Sverdlovsk District, Northern Urals, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Calciborite Crystallography

Axial Ratios:

a:b:c =0.6068:1:0.362

Cell Dimensions:

a = 8.38, b = 13.81, c = 5, Z = 8; V = 578.64 Den(Calc)= 2.89

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pccn

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

By Intensity(I/I_o): 1.867(1), 3.445(1), 1.97(0.9),

Crystal Structure:

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Shashkin D N , Simonov M A , Belov N V , Doklady Akademii Nauk SSSR , 195 (1970) p.345-348, Crystal structure of calciborite CaB2O4=Ca2[BO3BO]2

Physical Properties of Calciborite

Cleavage:

None

Color:

White.

Density:

2.878

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

3.5 - Copper Penny

Streak:

white

Optical Properties of Calciborite

Gladstone-Dale:

CI meas= -0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2213,KPDmeas= 0.2223,KC= 0.2128

Optical Data:

Biaxial (-), a=1.595, b=1.654, g=1.67, bire=0.0750, 2V(Calc)=52, 2V(Meas)=54.

Calculated Properties of Calciborite

Electron Density:

r_electron=2.85 gm/cc
note: r_Calciborite=2.89 gm/cc.

Fermion Index

Fermion Index = 0.0349
Boson Index = 0.9651

Photoelectric:

PE_Calciborite= 4.14 barns/electron
U=PE_Calciborite x r_electron= 11.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Calciborite is Not Radioactive

Calciborite Classification

Dana Class:

24.5.2.1 (24)Borates - Anhydrous

(24.5)with miscellaneous formulae

(24.5.2)Dana Group

24.5.2.1 Calciborite CaB2O4 Pccn 2/m 2/m 2/m

Strunz Class:

V/J.02-10 V - Nitrates, Carbonates and Borates

V/J - Chain borates with [B2O4]2- to [B6O10]2-

V/J.02 - Calciborite - Aldzhanite(?) series

V/J.02-10 Calciborite CaB2O4 Pccn 2/m 2/m 2/m

V/J.02-20 Chelkarite CaMgB2O4Cl2·7(H2O)(?) P bca 2/m 2/m 2/m

V/J.02-30 Aldzhanite? CaMgB2O4Cl·7(H2O)(?) Unk Ortho

Other Calciborite 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 Calciborite :
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 Calciborite Specimen Label here :

Calciborite

CaB2O4
Dana No: 24.5.2.1 Strunz No: V/J.02-10
Locality:

Notes: