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Cavansite

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Formula:
Ca(VO)Si
 
4
O
 
10
· 4H
 
2
O
System:OrthorhombicColour:Greenish-blue to blue
Lustre:VitreousHardness:3 - 4
Name:For the elements calcium, vanadium, and silicon in the composition.
Dimorph of:Pentagonite


Ishida et al. (2009) suggest that cavansite is a low-temperature form and pentagonite a high-temperature from.

Classification of Cavansite

IMA status:Approved 1967
Strunz 8th edition ID:8/H.36-10
Nickel-Strunz 10th (pending) edition ID:9.EA.50

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

74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips
Hey's CIM Ref.:14.14.1

14 : Silicates not Containing Aluminum
14 : Silicates of V and Bi
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Type Occurrence of Cavansite

Type Locality:Owyhee Dam, Lake Owyhee State Park, Malheur Co., Oregon, USA
Year of Discovery:1967

Occurrences of Cavansite

Geological Setting:Basalt vesicular filling.

Physical Properties of Cavansite

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

Crystallography of Cavansite

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 Volume:V 1,286.45 ų (Calculated from Unit Cell)
Z:4
Morphology:Prismatic crystals, spherulitic rosettes.
Comment:Space group Pcnm.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Cavansite

Type:Biaxial (+)
RI values: nα = 1.542(2) nβ = 1.544(2) nγ = 1.551(2)
2V:Measured: 52° , Calculated: 58°
Maximum Birefringence:δ = 0.009

Chart 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 Cavansite

Formula:
Ca(VO)Si
 
4
O
 
10
· 4H
 
2
O
Simplified for copy/paste:Ca(VO)Si4O10·4H2O
Essential elements:Ca, H, O, Si, V
All elements listed in formula:Ca, H, O, Si, V

Relationship of Cavansite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EA.05Cuprorivaite
CaCu[Si
 
4
O
 
10
]
9.EA.05Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
9.EA.05Effenbergerite
BaCu[Si
 
4
O
 
10
]
9.EA.05Wesselsite
SrCu[Si
 
4
O
 
10
]
9.EA.10Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
9.EA.15Fluorapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
9.EA.15Hydroxyapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
9.EA.15Fluorapophyllite-(Na)
NaCa
 
4
(Si
 
8
O
 
20
)F · 8H
 
2
O
9.EA.20Magadiite
Na
 
2
Si
 
14
O
 
29
· 11H
 
2
O
9.EA.25Dalyite
K
 
2
ZrSi
 
6
O
 
15
9.EA.25Davanite
K
 
2
TiSi
 
6
O
 
15
9.EA.30Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
9.EA.30Sazhinite-(La)
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
9.EA.35Armstrongite
CaZr[Si
 
6
O
 
15
] · 3H
 
2
O
9.EA.40Okenite
CaSi
 
2
O
 
5
· 2H
 
2
O
9.EA.45Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
9.EA.55Pentagonite
Ca(VO)Si
 
4
O
 
10
· 4H
 
2
O
9.EA.60Penkvilksite
Na
 
4
Ti
 
2
Si
 
8
O
 
22
· 4H
 
2
O
9.EA.60Tumchaite
Na
 
2
Zr(Si
 
4
O
 
11
) · 2H
 
2
O
9.EA.65Nabesite
Na
 
2
BeSi
 
4
O
 
10
· 4H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
AlSi
 
9
O
 
24
(OH)
 
6
· 3H
 
2
O
9.EA.75Zeravshanite
Na
 
2
Cs
 
4
Zr
 
3
[Si
 
18
O
 
45
]*2H
 
2
O
9.EA.80Bussyite-(Ce)
(Ce,REE)
 
3
(Na,H
 
2
O)
 
6
MnSi
 
9
Be
 
5
(O,OH)
 
30
F
 
4
9.EA.85Plumbophyllite
Pb
 
2
Si
 
4
O
 
10
· H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.14.2Pentagonite
Ca(VO)Si
 
4
O
 
10
· 4H
 
2
O
14.14.3Goldmanite
Ca
 
3
V
3+
2
(SiO
 
4
)
 
3
14.14.4Haradaite
SrVSi
 
2
O
 
7
14.14.5Saneroite
Na
 
2
(Mn,Mn)
 
10
Si
 
11
VO
 
34
(OH)
 
4
14.14.6Erlianite
(Fe,Mg)
 
4
(Fe,V)
 
2
Si
 
6
O
 
15
(OH,O)
 
8
14.14.7Eulytine
Bi
 
4
(SiO
 
4
)
 
3
14.14.8Bismutoferrite
Fe
3+
2
Bi(SiO
 
4
)
 
2
(OH)

Other Names for Cavansite

Synonyms:
IMA1967-019
Other Languages:
Dutch:Cavansiet
German:Cavansit
Italian:Cavansite
Low Saxon:Cavansit
Polish:Cavansyt
Russian:Кавансит
Spanish:Cavansita

Other Information

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

References for Cavansite

Reference List:

- +
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

Mindat.org articles about Cavansite

Article entries:
Field Trip to Cavansite Type LocailityKeith Wood

Internet Links for Cavansite

Search Engines:
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  • External Links:
  • Look for Cavansite on Webmineral
  • Look for Cavansite on Athena Mineralogy
  • Look for Cavansite on Wikipedia
  • Look for Cavansite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Cavansite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Fine Minerals from Weinrich Minerals, Inc.
  • Fabre Minerals - search for Cavansite specimens
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  • Search for Cavansite on Well-Arranged Molecules
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  • Wilensky Fine Minerals
  • Buy rare minerals from Excalibur Minerals
  • Buy fine minerals and gemstones from Pala International
  • The Arkenstone - Fine Minerals
  • Specimens:The following Cavansite specimens are currently listed for sale on minfind.com.

    Localities for Cavansite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    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.
    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.
      • Malheur Co.
        • Lake Owyhee State Park
    Progr.Ann.Meeting Geol.Soc.Amer.(1967) p. 211
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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