Vesuvianite (Idocrase)

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Physical & Optical Properties

Mohs Hardness 6.5
Specific Gravity 3.25 – 3.5
Refractive Index 1.7 – 1.725
Crystal System Tetragonal
Luster Greasy
Cleavage Indistinct
Fracture Uneven,Splintery
Color various
Birefringence 0.002
Dispersion 0.019
Pleochroism Orange/brown vesuvianite - weak: light body color - dark body color; Green - weak: yellow-green - yellow-brown; Yellow - weak: colorless - yellow

Mohs Hardness

Mohs Hardness: 6.5
1 Soft10 Hard

Crystal System

a b c Tetragonal a = b ≠ c, α = β = γ = 90°

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Vesuvianite (Idocrase)

About Vesuvianite (Idocrase)

Vesuvianite, also called Idocrase, is a complex calcium aluminum silicate mineral occurring in green, yellow-green, brown, blue, and purple colors with a vitreous to resinous luster, most famously discovered at the base of Mount Vesuvius in Italy. Californite, a jade-like massive green variety, is found in Fresno County, California, while transparent gemmy stones occur in Quebec and Pakistan. Its range of colors and the fine crystals from classic European localities make it a diverse and interesting collector's gem.

Jewelry Use

Durability 6/10

Science FYI Family

Frequently Asked Questions

What is Vesuvianite (Idocrase)?
Vesuvianite, also called Idocrase, is a complex calcium aluminum silicate mineral occurring in green, yellow-green, brown, blue, and purple colors with a vitreous to resinous luster, most famously discovered at the base of Mount Vesuvius in Italy. Californite, a jade-like massive green variety, is f
What is the hardness of Vesuvianite (Idocrase)?
Vesuvianite (Idocrase) has a Mohs hardness of 6.5, making it moderate for use in jewelry.
What color is Vesuvianite (Idocrase)?
Vesuvianite (Idocrase) is primarily Various.
How much does Vesuvianite (Idocrase) cost?
Vesuvianite (Idocrase) falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Vesuvianite (Idocrase)?
Vesuvianite (Idocrase) belongs to the Tetragonal crystal system.

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