Cavansite | Gemopedia

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."
Colors
Greenish Blue To Blue

Cavansite Classification

Common Name

Cavansite

Species

Cavansite

Variety

Colors

Greenish Blue To Blue

Alternate Names

Gemstone Groups

Key Separations

Optic character, appearance and pleochroism.

Comments

Cavansite Optical Properties

Transparency

Transparent

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

CCF Reaction

Pleochroism

Dichroic, strong colorless and blue

Dispersion

Strength: weak fire

Comments

Cavansite Chemistry & Crystallography

Chemical Name

hydrated calcium vanadium silicate

Chemical Formula

Ca(VO)Si4O10.4H2O

Synthesis

Crystal System

Orthorhombic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Cavansite Characteristic Physical Properties

Hardness

3-4

Streak

Specific Gravity

2.21-2.31

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

Good, in one direction

Comments

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