Uralborite Mineral Data

Uralborite Mineral Data +

General Uralborite Information

Chemical Formula:

CaB2O2(OH)4

Composition:

Molecular Weight = 161.73 gm

Calcium 24.78 % Ca 34.67 % CaO

Boron 13.37 % B 43.05 % B₂O₃

Hydrogen 2.49 % H 22.28 % H₂O

Oxygen 59.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaB₂O₂(OH)₄

IMA Status:

Approved IMA 1961

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 200158

PDF 14-272

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Uralborite Crystallography

Axial Ratios:

a:b:c =0.5592:1:0.7956

Cell Dimensions:

a = 6.881, b = 12.305, c = 9.791, Z = 8; beta = 97.46° V = 821.99 Den(Calc)= 2.61

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): 2.13(1), 7.61(1), 2.97(0.9),

Crystal Structure:

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Simonov M A , Egorov-Tismenko Y K , Belov N V , Doklady Akademii Nauk SSSR , 234 (1977) p.822-825, Accurate crystal structure of uralborite, Ca2[B4O4(OH)8]

Physical Properties of Uralborite

Cleavage:

[???] Indistinct

Color:

Colorless.

Density:

2.6

Diaphaniety:

Transparent

Hardness:

4 - Fluorite

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Uralborite

Gladstone-Dale:

CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2335,KPDmeas= 0.2344,KC= 0.2411

Optical Data:

Biaxial (+), a=1.604, b=1.609, g=1.615, bire=0.0110

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Uralborite

Electron Density:

r_electron=2.64 gm/cc
note: r_Uralborite=2.60 gm/cc.

Fermion Index

Fermion Index = 0.02722
Boson Index = 0.97278

Photoelectric:

PE_Uralborite= 3.21 barns/electron
U=PE_Uralborite x r_electron= 8.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Uralborite is Not Radioactive

Uralborite Classification

Dana Class:

25.3.4.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.3)Dana Type

(25.3.4)Dana Group

25.3.4.1 Uralborite CaB2O2(OH)4 P 2₁/n 2/m

Strunz Class:

V/H.08-10 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.08 - Uralborite series

V/H.08-10 Uralborite CaB2O2(OH)4 P 2₁/n 2/m

Other Uralborite 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 Uralborite :
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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Uralborite

CaB2O2(OH)4
Dana No: 25.3.4.1 Strunz No: V/H.08-10
Locality:

Notes: