Cavansite
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameCavansite
Chemical FormulaCa(VO)Si4O10·4H2O
Mohs Hardness3.5
Crystal Systemorthorhombic
Lustervitreous
Streak Colorbluish white
Cleavageperfect on {010}
Fractureuneven
Specific Gravity2.27
Colorsintense blue, dark blue
Transparencytransparent
Type LocalityWagholi Quarry, Pune District, Maharashtra, India
Mineral GroupPhyllosilicates
Usescollector
Associated Mineralsstilbite, heulandite, apophyllite, calcite
Rarityuncommon
Description
This specimen features a striking, intense blue, spherical aggregate of cavansite crystals, exhibiting a vibrant color and delicate structure, perched on a light-colored, crystalline matrix.
Geological Context
Cavansite is a secondary mineral that forms in the amygdaloidal cavities of basaltic volcanic rocks, often found in association with zeolite minerals. It is characteristic of the Deccan Traps flood basalts in India.
