Cassiterite

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Physical & Optical Properties

Mohs Hardness 6,0 – 7,0
Specific Gravity 6,86 – 7,03
Refractive Index 1,99 – 2,105
Crystal System Tetragonal
Cleavage Indistinct
Fracture Conchoidal
Color various
Birefringence 0,096
Dispersion 0,071
Pleochroism Weak to strong; green-yellow, brown, red-brown

Mohs Hardness

Mohs Hardness: 6,0 – 7,0
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Cassiterite

Cassiterite is a tin oxide mineral that serves as the primary ore of tin, forming brown to black, reddish brown, or rarely colorless tetragonal crystals with a brilliant, adamantine luster. Transparent to translucent reddish-brown faceted stones are cut as collector gems that can display exceptional brilliance, and the mineral forms distinctive 'wood tin' botryoidal masses with a wood-grain appearance. Major sources for gem crystals include Bolivia, Mexico, and the Democratic Republic of Congo.

Jewelry Use

Durability 5/10

Science FYI Family

Frequently Asked Questions

What is Cassiterite?
Cassiterite is a tin oxide mineral that serves as the primary ore of tin, forming brown to black, reddish brown, or rarely colorless tetragonal crystals with a brilliant, adamantine luster. Transparent to translucent reddish-brown faceted stones are cut as collector gems that can display exceptional
What is the hardness of Cassiterite?
Cassiterite has a Mohs hardness of 6.0 to 7.0, making it moderate for use in jewelry.
What color is Cassiterite?
Cassiterite is primarily Various.
How much does Cassiterite cost?
Cassiterite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Cassiterite?
Cassiterite belongs to the Tetragonal crystal system.

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