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Cavansite

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Formula:
Ca(VO)Si4O10 · 4H2O
Colour:
Greenish-blue to blue
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
2.21 - 2.31
Crystal System:
Orthorhombic
Name:
For the elements calcium, vanadium, and silicon in the composition.
Dimorph of:
Ishida et al. (2009) suggest that cavansite is a low-temperature form and pentagonite a high-temperature form.


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Classification of CavansiteHide

Approved
Approval Year:
1967
9.EA.50

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
74.3.7.1

74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips
14.14.1

14 : Silicates not Containing Aluminum
14 : Silicates of V and Bi

Physical Properties of CavansiteHide

Vitreous
Transparency:
Transparent
Colour:
Greenish-blue to blue
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {010}
Density:
2.21 - 2.31 g/cm3 (Measured)    2.33 g/cm3 (Calculated)

Optical Data of CavansiteHide

Type:
Biaxial (+)
RI values:
nα = 1.542(2) nβ = 1.544(2) nγ = 1.551(2)
2V:
Measured: 52° , Calculated: 58°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v extreme
Pleochroism:
Visible
Comments:
X=Z= colorless
Y= blue

Chemical Properties of CavansiteHide

Formula:
Ca(VO)Si4O10 · 4H2O
IMA Formula:
CaV4+OSi4O10 · 4H2O

Crystallography of CavansiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 9.792(2) Å, b = 13.644(3) Å, c = 9.629(2) Å
Ratio:
a:b:c = 0.718 : 1 : 0.706
Unit Cell V:
1,286.45 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic crystals, spherulitic rosettes.
Comment:
Space group Pcnm.

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of CavansiteHide

Synonyms of CavansiteHide

Other Language Names for CavansiteHide

Dutch:Cavansiet
German:Cavansit
Italian:Cavansite
Low Saxon:Cavansit
Polish:Cavansyt
Spanish:Cavansita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Stilbite-Ca312 photos of Cavansite associated with Stilbite-Ca on mindat.org.
Stilbite233 photos of Cavansite associated with Stilbite on mindat.org.
Calcite83 photos of Cavansite associated with Calcite on mindat.org.
Heulandite82 photos of Cavansite associated with Heulandite on mindat.org.
Mordenite23 photos of Cavansite associated with Mordenite on mindat.org.
Quartz16 photos of Cavansite associated with Quartz on mindat.org.
Heulandite-Ca16 photos of Cavansite associated with Heulandite-Ca on mindat.org.
Okenite13 photos of Cavansite associated with Okenite on mindat.org.
Pentagonite7 photos of Cavansite associated with Pentagonite on mindat.org.
Apophyllite6 photos of Cavansite associated with Apophyllite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EA.05CuprorivaiteCaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05GillespiteBaFe2+Si4O10Tet.
9.EA.05EffenbergeriteBaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05WesselsiteSrCuSi4O10Tet.
9.EA.10EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet.
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
9.EA.20MagadiiteNa2Si14O29 · 11H2OMon.
9.EA.25DalyiteK2ZrSi6O15Tric.
9.EA.25DavaniteK2TiSi6O15Tric.
9.EA.30Sazhinite-(Ce)Na2CeSi6O14•6H2O
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2OOrth. mm2 : Pmm2
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2OMon.
9.EA.40OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
9.EA.45NekoiteCa3Si6O15·7H2OTric. 1 : P1
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2OMon.
9.EA.65NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2OTric.
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2OMon. 2/m : B2/b
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4Mon. 2/m : B2/b
9.EA.85PlumbophyllitePb2Si4O10 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn

Related Minerals - Dana Grouping (8th Ed.)Hide

74.3.7.2PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.14.2PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
14.14.3GoldmaniteCa3V3+2(SiO4)3Iso.
14.14.4HaradaiteSrVSi2O7Orth.
14.14.5SaneroiteNaMn2+5[Si5O14(OH)](VO3)(OH)Tric.
14.14.6Erlianite(Fe,Mg)4(Fe,V)2Si6O15(OH,O)8Orth.
14.14.7EulytineBi4(SiO4)3Iso. 4 3m : I4 3d
14.14.8BismutoferriteFe3+2Bi(SiO4)2(OH)Mon. m : Bm

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for CavansiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Staples, L.W., H.T. Evans, Jr., and J.R. Lindsay (1973): Cavansite and pentagonite, new dimorphous calcium vanadium silicate minerals from Oregon. Amer. Mineral., 58, 405-411.
Evans, H.T., Jr. (1973): The crystal structures of cavansite and pentagonite. Amer. Mineral., 58, 412-424.
Wilke, H.-J., G. Schnorrer-Köhler, and A. Bahle (1989): Cavansit aus Indien. Lapis, 14 (1), 39-42 (in German).
Ishida, N., Kimata, M., Nishida, N., Hatta, T., Shimizu, M., Akasaka, T. (2009): Polymorphic relation between cavansite and pentagonite: Genetic implications of oxonium ion in cavansite. Journal of Mineralogical and Petrological Sciences, 104, 241-252.

Internet Links for CavansiteHide

Localities for CavansiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Rio Grande do Sul
    • Morro Reuter
Lapis 29(9), 41-42 (2004)
Iceland
http://en.ni.is/geology/minerals/cavansite/
India
 
  • Maharashtra
    • Pune District (Poonah District)
      • Lonavale (Lonavala)
Praszkier, T. & Siuda, R. (2007): The Lonavala Quarry, Pune District, Maharashtra, India. Mineralogical Record 38: 185-189
      • Talegaon
Praszkier, T. (2009): Cavansit und Pentagonit aus Indien. Mineralien-Welt 20 (6), 16-25.
Praszkier, T. (2009): Cavansit und Pentagonit aus Indien. Mineralien-Welt 20 (6), 16-25.
[www.johnbetts-fineminerals.com]
http://www.hedegaard.com/Localities/India/Wagholi/Wagholi.html
Rocks & Min.:64(5):413.
Natural History Museum Vienna collection
Min Rec 2007 38:185-189
    • Satara District
Min Rec 2007 38:185-189
    • Sindhudurg District
      • Sutarwadi
Min Rec 2007 38:185-189
New Zealand
 
  • North Island
    • Northland
      • Kaipara
        • Aranga
Lapis 29(9), 41-42 (2004)
USA
 
  • Oregon
    • Columbia Co.
      • Goble
Rocks & Minerals: 64(5): 413.
Wieting, A.B. (1995) Cavansite from the Jaquish Road Cut, Goble, Columbia County, Oregon. Micro Probe V 8, No. 1, pp. 14-16.
    • Malheur Co.
      • Lake Owyhee State Park
Progr.Ann.Meeting Geol.Soc.Amer.(1967) p. 211
Mineral and/or Locality  
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