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Cavansite

This page kindly sponsored in memory of Laszlo Z. Valachi
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About CavansiteHide

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.


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:
Ca(V4+O)(Si4O10) · 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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000316CavansiteEvans H T (1973) The crystal structures of cavansite and pentagonite American Mineralogist 58 412-42419730293
0019718CavansiteDanisi R M, Armbruster T, Lazic B (2012) In situ dehydration behavior of zeolite-like cavansite: A single-crystal X-ray study American Mineralogist 97 1874-18802012Wagholi quarry, Poona district, India0293
0019719CavansiteDanisi R M, Armbruster T, Lazic B (2012) In situ dehydration behavior of zeolite-like cavansite: A single-crystal X-ray study American Mineralogist 97 1874-18802012Wagholi quarry, Poona district, India0348
0019720CavansiteDanisi R M, Armbruster T, Lazic B (2012) In situ dehydration behavior of zeolite-like cavansite: A single-crystal X-ray study American Mineralogist 97 1874-18802012Wagholi quarry, Poona district, India0448
0019721CavansiteDanisi R M, Armbruster T, Lazic B (2012) In situ dehydration behavior of zeolite-like cavansite: A single-crystal X-ray study American Mineralogist 97 1874-18802012Wagholi quarry, Poona district, India0623
0018620CavansiteHughes J M, Derr R S, Cureton F, Campana C F, Druschel G (2011) The crystal structure of cavansite: location of the H2O molecules and hydrogen atoms in Ca(VO)(Si4O10)*4H2O The Canadian Mineralogist 49 1267-12722011Pune, India0100
0018621CavansiteHughes J M, Derr R S, Cureton F, Campana C F, Druschel G (2011) The crystal structure of cavansite: location of the H2O molecules and hydrogen atoms in Ca(VO)(Si4O10)*4H2O The Canadian Mineralogist 49 1267-12722011Pune, India0293
0019264CavansiteIshida N, Kimata M, Nishida N, Hatta T, Shimizu M, Akasaka T (2009) Polymorphic relation between cavanite and pentagonite: genetic implications of oxonium ion in cavansite Journal of Mineralogical and Petrological Sciences 104 241-2522009Deccan basalts, Wagholi, India0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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

Geological EnvironmentHide

Geological Setting:
Basalt vesicular filling.

Type Occurrence of CavansiteHide

Synonyms of CavansiteHide

Other Language Names for CavansiteHide

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

Common AssociatesHide

Associated Minerals Based on Photo Data:
312 photos of Cavansite associated with Stilbite-CaNaCa4[Al9Si27O72] · nH2O
233 photos of Cavansite associated with Stilbite subgroupM6-7[Al8-9Si27-28O72] · nH2O
83 photos of Cavansite associated with CalciteCaCO3
82 photos of Cavansite associated with Heulandite
23 photos of Cavansite associated with Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
16 photos of Cavansite associated with QuartzSiO2
16 photos of Cavansite associated with Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
13 photos of Cavansite associated with OkeniteCa10Si18O46 · 18H2O
7 photos of Cavansite associated with PentagoniteCa(VO)Si4O10 · 4H2O
6 photos of Cavansite associated with Apophyllite

Related Minerals - Nickel-Strunz GroupingHide

9.EA.Bussyite-(Y)(Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34Mon. 2 : B2
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 · 6H2OOrth. mm2 : Pmm2
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., Evans, H.T Jr., Lindsay, J.R. (1967) Cavansite, a new calcium vanadium silicate mineral (abstr.). Geological Society of America, Program Annual Meeting: 211-212.
Fleischer, M. (1968) New mineral names. American Mineralogist: 53: 507-511.
Staples, L.W., Evans, H.T. Jr., Lindsay, J.R. (1973) Cavansite and pentagonite, new dimorphous calcium vanadium silicate minerals from Oregon. American Mineralogist: 58: 405-411.
Evans, H.T., Jr. (1973) The crystal structures of cavansite and pentagonite. American Mineralogist: 58: 412-424.
Wilke, H.-J., Schnorrer-Köhler, G., Bahle, A. (1989) Cavansit aus Indien. Lapis: 14(1): 39-42. (in German)
Powar, K.B., Byrappa, K. (2001) X-ray, thermal and infared studies of cavansite from Wagholi western Maharashtra, India. Journal of Mineralogical and Petrological Sciences: 96: 1-6.
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.
Hughes, J.M., Derr, R.S., Cureton, F., Campana, C.F., Druschel, G. (2011) The crystal structure of cavansite: location of the H2O molecules and hydrogen atoms in Ca(VO)(Si4O10)·4H2O. The Canadian Mineralogist: 49: 1267-1272.
Danisi, R.M., Armbruster, T., Lazic, B. (2012) In situ dehydration behavior of zeolite-like cavansite: A single-crystal X-ray study. American Mineralogist: 97: 1874-1880.
Martucci, A., Rodeghero, E., Cruciani, G. (2016) Continuous dehydration of cavansite under dynamic conditions: an in situ synchrotron powder-diffraction study. European Journal of Mineralogy: 28: 5-13.

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
      • Lonavale (Lonavala)
Praszkier, T., Siuda, R. (2007) The Lonavala quarry, Pune district, Maharashtra, India. The Mineralogical Record: 38(3): 185-189.
      • Maval
        • Talegaon Dabhade
Praszkier, T. (2009): Cavansit und Pentagonit aus Indien. Mineralien-Welt 20 (6), 16-25.
Ottens, B., Götze, J., Schuster, R., Krenn, K., Hauzenberger, C., Zsolt, B., & Vennemann, T. (2019). Exceptional Multi Stage Mineralization of Secondary Minerals in Cavities of Flood Basalts from the Deccan Volcanic Province, India. Minerals, 9(6), 351.
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
Praszkier, T., Siuda, R. (2007) The Lonavala quarry, Pune district, Maharashtra, India. The Mineralogical Record: 38(3): 185-189.
    • Satara District
Praszkier, T., Siuda, R. (2007) The Lonavala quarry, Pune district, Maharashtra, India. The Mineralogical Record: 38(3): 185-189.
    • Sindhudurg District
      • Sutarwadi
Praszkier, T., Siuda, R. (2007) The Lonavala quarry, Pune district, Maharashtra, India. The Mineralogical Record: 38(3): 185-189.
New Zealand
 
  • Northland Region
    • Kaipara District
      • Aranga
Lapis 29(9), 41-42 (2004). Graham, I.T., Judd, K., Colchester, D.M., Hager, S., Greig, A., Lay, A. (2018) The cause of colour in thomsonite-Ca from Aranga quarry, Northland, New Zealand. Australian Journal of Mineralogy, 19:2, 7-13.
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
Staples, L.W., Evans, H.T Jr., Lindsay, J.R. (1967) Cavansite, a new calcium vanadium silicate mineral (abstr.). Geological Society of America, Program Annual Meeting: 211-212.; Staples, L.W., Evans, H.T. Jr., Lindsay, J.R. (1973) Cavansite and pentagonite, new dimorphous calcium vanadium silicate minerals from Oregon. American Mineralogist: 58: 405-411.
 
Mineral and/or Locality  
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