Cavansite

Formula: Ca(VO)Si4O10 · 4H2O

Species:

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.

Type Locality: Owyhee Dam, Lake Owyhee State Park, Malheur Co., Oregon – USA

Dimorph of: Pentagonite. Cavansite might be a low-temperature form and pentagonite a high-temperature form.