Vimsite Mineral Data

Vimsite Mineral Data +

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General Vimsite 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 1968

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 25102

PDF 21-134

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Vimsite Crystallography

Axial Ratios:

a:b:c =1.0319:1:0.4572

Cell Dimensions:

a = 10.02, b = 9.71, c = 4.44, Z = 4; beta = 92° V = 431.72 Den(Calc)= 2.49

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.48(1), 2.222(0.8), 3.72(0.7),

Crystal Structure:

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Shashkin D P , Simonov M A , Belov N V , Doklady Akademii Nauk SSSR , 182 (1968) p.821-824, Crystal structure of a new natural borate vimsite Ca[B2O2(OH)4]

Physical Properties of Vimsite

Cleavage:

[???] Perfect

Color:

Colorless.

Density:

2.54

Diaphaniety:

Transparent

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Vimsite

Gladstone-Dale:

CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2427,KPDmeas= 0.2379,KC= 0.2411

Optical Data:

Biaxial (-), a=1.585, b=1.614, g=1.614, bire=0.0290, 2V(Calc)=0, 2V(Meas)=28.

Calculated Properties of Vimsite

Electron Density:

r_electron=2.53 gm/cc
note: r_Vimsite=2.49 gm/cc.

Fermion Index

Fermion Index = 0.02722
Boson Index = 0.97278

Photoelectric:

PE_Vimsite= 3.21 barns/electron
U=PE_Vimsite x r_electron= 8.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vimsite is Not Radioactive

Vimsite Classification

Dana Class:

25.1.5.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.1)Dana Type

(25.1.5)Dana Group

25.1.5.1 Vimsite CaB2O2(OH)4 C 2/c 2/m

Strunz Class:

V/J.01-10 V - Nitrates, Carbonates and Borates

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

V/J.01 - Vimsite series

V/J.01-10 Vimsite CaB2O2(OH)4 C 2/c 2/m

Other Vimsite 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 Vimsite :
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 Vimsite Specimen Label here :

Vimsite

CaB2O2(OH)4
Dana No: 25.1.5.1 Strunz No: V/J.01-10
Locality:

Notes: