Vimsite Mineral Data

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

Environment:

Boron-rich copper-bearing skarn. Dimorphous with uralborite.

IMA Status:

Approved IMA 1968

Locality:

Novofrolovskoye copper deposit, Turinsk district, near Krasnoturinsk, Northern Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named For the 50th anniversary of the All-Union Scientific Research Institute of Mineral Resources [an acronym for Vses. Nauch.-Issled. Inst. Mineral. Syrya], Moscow, Russia.

Name Pronunciation:

Vimsite

Synonym:

ICSD 25102

PDF 21-134

Vimsite Image

Images:

Vimsite

Comments: White to transparent vein of vimsite crystals in matrix.
Location: Solongo B Deposit, Buriatia Republic, Eastern Siberia Region, Russia. Scale: Picture Size 8 x 10 mm.
© Diederik Visser

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 - Prismatic H-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),

Physical Properties of Vimsite

Cleavage:

{???} Perfect

Color:

Colorless.

Density:

2.54

Diaphaneity:

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
Ncalc = 1.6 - 1.61

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:

Bulk Density (Electron Density)=2.53 gm/cc
note: Specific Gravity of Vimsite =2.49 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Vimsite= 3.21 barns/electron
U=PE_Vimsite x rElectron Density= 8.12 barns/cc.

Radioactivity:

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

Vimsite Classification

Dana Class:

25.01.05.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.01)Dana Type

(25.01.05)Dana Group

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

Strunz Class:

06.BC.15 06 - BORATES

06.B - Diborates

06.BC -Ino-diborates with triangles and/or tetrahedra

06.BC.15 Vimsite CaB2O2(OH)4 C 2/c 2/m

Other Vimsite 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 Vimsite :
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 Vimsite Specimen Label here :

Vimsite

CaB2O2(OH)4
Dana No: 25.01.05.01 Strunz No: 06.BC.15
Locality:

Notes:

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