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

Ca(VO)Si4O10 · 4H2O
Greenish-blue to blue
3 - 4
Specific Gravity:
2.21 - 2.31
Crystal System:
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

Approval Year:

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

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

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

Physical Properties of CavansiteHide

Greenish-blue to blue
3 - 4 on Mohs scale
Good on {010}
2.21 - 2.31 g/cm3 (Measured)    2.33 g/cm3 (Calculated)

Optical Data of CavansiteHide

Biaxial (+)
RI values:
nα = 1.542(2) nβ = 1.544(2) nγ = 1.551(2)
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:
r < v extreme
X=Z= colorless
Y= blue

Chemical Properties of CavansiteHide

Ca(VO)Si4O10 · 4H2O
IMA Formula:
Ca(V4+O)(Si4O10) · 4H2O

Crystallography of CavansiteHide

Crystal System:
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
a:b:c = 0.718 : 1 : 0.706
Unit Cell V:
1,286.45 ų (Calculated from Unit Cell)
Prismatic crystals, spherulitic rosettes.
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.

Geological EnvironmentHide

Geological Setting:
Basalt vesicular filling.

Type Occurrence of CavansiteHide

Synonyms of CavansiteHide

Other Language Names for CavansiteHide

Low Saxon/Low German:Cavansit

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 subgroup
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.05EffenbergeriteBaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
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.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 · 4H2OOrth. mm2

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.14.2PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
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.
  • Rio Grande do Sul
    • Morro Reuter
Lapis 29(9), 41-42 (2004)
  • Maharashtra
    • Pune District
      • Lonavale (Lonavala)
Praszkier, T. & Siuda, R. (2007): The Lonavala Quarry, Pune District, Maharashtra, India. Mineralogical Record 38: 185-189
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.
      • 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.
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
  • 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.
  • 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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