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Mineralpedia Details for Cavansite

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Cavansite

Cavansite

Named for the calcium (ca), vanadium (van), and silicon (si) in the composition of the mineral. Cavansite is a rare mineral that occurs in the USA in Oregon at the type locality at Owyhee Dam in Malheur County and at the Charles W. Chapman quarry in Columbia County, in several localities in India with noteably remarkable specimens from the Wagholi area in Maharashtra, and newer localities in New Zealand at the Aranga quary on the North Island and in Brazil at the Municipal quarry in Rio Grande do Sul. Cavansite occurs in tuff filling fault fissures, in a basalt and tuff breccias as cavity fillings and in veinlets, and in pores of altered basalt breccias and tuffaceous andesites.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/cavansite.pdf

Formula
Ca(V4+O)Si4O10ยท4H2
Crystal System
Orthorhombic 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
greenish blue, dark blue 
Streak
bluish white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
3-4 
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Cavansite from Wagholi, near Pune, Maharashtra, India

Cavansite
            from Wagholi, near Pune, Maharashtra, India

Deep, lustrous blue crystal sprays to 1cm across perched nicely on white Stilbite and Apophyllite matrix.

Neon blue spray of bladed Cavansite to 8mm on a white Stilbite crystal to 1.3cm.

Deep blue crystal clusters to 1.2cm on Stilbite matrix.

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Cavansite from Owyhee Dam, Malheur Co., Oregon, United States

Cavansite
            from Owyhee Dam, Malheur Co., Oregon, United States
Special Info
Type Locality

Type locality bright blue, platy cavansite. I

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