Mineralogy Database

Cavansite Mineral Data

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General Cavansite Information

Help on Chemical  Formula: Chemical Formula: Ca(VO)Si4O10•4(H2O)
Help on Composition: Composition: Molecular Weight = 451.42 gm
   Calcium    8.88 %  Ca   12.42 % CaO
   Vanadium  11.28 %  V    20.15 % V2O5
   Silicon   24.89 %  Si   53.24 % SiO2
   Hydrogen   1.79 %  H    15.96 % H2O
   Oxygen    53.16 %  O
            ______        ______ 
            100.00 %      101.77 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaV5+Si4O11•4(H2O)
Help on Environment: Environment: Secondary mineralization in basalts and andesites.
Help on IMA Status: IMA Status: Approved IMA 1973
Help on Locality: Locality: Deccan trap basalts, Poona, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its composition of calcium, vanadium, and silicon.
Help on Name Pronunciation: Name Pronunciation: Cavansite + Pronunciation Say CAVANSITE
Help on Synonym: Synonym: ICSD 1906
  PDF 25-182

Cavansite Image

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Comments: Brilliant blue balls of acicular crystals of cavansite to 1 cm in size richly scattered about a matrix of colorless stilbite crystals.
Location: Wagholi, Poona district, Maharashtra, India. Scale: 7.5 x 9 x 8 cm.
© Dan Weinrich

Cavansite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7148:1:0.7019
Help on Cell Dimensions: Cell Dimensions: a = 9.778, b = 13.678, c = 9.601, Z = 4; V = 1,284.07 Den(Calc)= 2.33
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.964(1), 6.854(0.5), 6.132(0.25),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 0 1) ( 1 1 0)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Cavansite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: Greenish blue, Dark blue.
Help on Density: Density: 2.21 - 2.31, Average = 2.25
Help on Diaphaneity: Diaphaneity: Subtransparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: bluish white

Optical Properties of Cavansite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.07 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2342,KPDmeas= 0.2414,KC= 0.2596
Ncalc = 1.57 - 1.6
Help on Optical Data: Optical Data: Biaxial (+), a=1.542, b=1.544, g=1.551, bire=0.0090, 2V(Calc)=58, 2V(Meas)=52.

Calculated Properties of Cavansite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.27 gm/cc
note: Specific Gravity of Cavansite =2.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PECavansite = 4.15 barns/electron
U=PECavansite x rElectron Density= 9.42 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cavansite is Not Radioactive

Cavansite Classification

Help on  Dana Class: Dana Class: (74)Phyllosilicate Modulated Layers
  (74.03)with joined strips
  (74.03.07)V phyllosilicates Cavansite Ca(VO)Si4O10•4(H2O) Pcmn 2/m 2/m 2/m Pentagonite Ca(VO)Si4O10•4(H2O) Ccm21 mm2
Help on  Strunz Class: Strunz Class: 09.EA.50 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
09.EA.50 Cavansite Ca(VO)Si4O10•4(H2O) Pcmn 2/m 2/m 2/m

Other Cavansite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Cavansite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - CalTech Mineral Spectroscopy
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info

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Dana No: Strunz No: 09.EA.50





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