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Very distinctive in appearance, cavansite is a rare, not to mention strikingly beautiful, blue mineral. Its name is derived from its composition: calcium, vanadium and silicon. Only discovered in the 1960's in Oregon, cavansite is highly sought after by mineral collectors across the globe. Found in a scant few locales, cavansite sources include Brazil, India, New Zealand and Oregon USA. It is renowned for its stunning deep blue hues that are sometimes vivid enough to be described as "electric blue."

Cavansite Polished
Cavansite Classification
Common Name Cavansite
Species Cavansite
Cavansite Optical Properties
Transparency Transparent
Dispersion Strength: Weak Fire
Refractive Index 1.542-1.551
Birefringence 0.009
Optic Character Biaxial
Optic Sign Positive
Polariscope Reaction Doubly Refractive (DR)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism Dichroic, strong colorless and blue
Cavansite Characteristic Physical Properties
Hardness 3-4
Specific Gravity 2.210-2.310
Toughness Poor
Luster Vitreous
Fracture Conchoidal
Cleavage Good, in one direction
Cavansite Chemistry & Crystallography
Chemical Name hydrated calcium vanadium silicate
Chemical Formula Ca(VO)Si4O10.4H2O
Crystal System Orthorhombic
Chemistry Classification Silicate

Cavansite Colors

  • Blue Cavansite Blue

Countries of Origin


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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.