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Cavansite

Big Photo

Wagholi Quarry, Wagholi, Pune District (Poonah District), Maharashtra, India
© Rob Lavinsky

Show Cavansite Photos (210)
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
This page provides mineralogical data about Cavansite.

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.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
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
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.15Apophyllite-(KF)
KCa
 
4
[(F,OH)|Si
 
8
O
 
20
] · 8H
 
2
O
9.EA.15Apophyllite-(KOH)
KCa
 
4
[(OH,F)|Si
 
8
O
 
20
] · 8H
 
2
O
9.EA.15Apophyllite-(NaF)
NaCa
 
4
[F|Si
 
8
O
 
20
] · 8H
 
2
O
9.EA.20Magadiite
NaSi
 
7
O
 
13
(OH)
 
3
·3H
 
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
 * 4 H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
[(OH)
 
6
|AlSi
 
9
O
 
24
] · 3H
 
2
O
9.EA.75Zeravshanite
Cs
 
4
Na
 
2
Zr
 
3
[Si
 
18
O
 
45
](H
 
2
O)
 
2
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+
 
,Al,Fe
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[OH|(SiO
 
4
)
 
2
]

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:American Mineralogist: 58: 405-424.

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 Cavansite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Cavansite in the Natural History Museum (London) online catalogue
  • Cavansite details from Handbook of Mineralogy (PDF)
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    Localities for Cavansite

    Hide Locality List
    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
     
    • South Region
      • Rio Grande do Sul
        • Morro Reuter
    		Lapis 29(9), 41-42 (2004)
    India
     
    • Maharashtra
      • Pune District (Poonah District)
        • Lonavale (Lonavala)
    		Min Rec 2007 38:185-189
        • Pashan
    		No reference listed
        • Wagholi
    		http://www.hedegaard.com/Localities/India/Wagholi/Wagholi.html
    Rocks & Min.:64(5):413.
    [www.johnbetts-fineminerals.com]
    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
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the 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 hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 28th Oct 2009 14:22:57