Forsterite

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Physical & Optical Properties

Mohs Hardness 6.5 – 7.0
Specific Gravity 3.23 – 3.26
Refractive Index 1.635 – 1.671
Crystal System Orthorhombic
Cleavage Imperfect
Fracture Conchoidal
Color various
Birefringence 0.034
Pleochroism tanzanite
Fluorescence tanzanite

Mohs Hardness

Mohs Hardness: 6.5 – 7.0
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Forsterite

Forsterite is the magnesium-rich end-member of the olivine series, appearing in colorless, pale yellow, or pale green tones and forming in ultramafic igneous and metamorphic rocks worldwide. Gem-quality transparent forsterite is faceted into brilliantly clear stones with good dispersion, valued by collectors for their purity and high refractive index. Notable gem sources include Pakistan's Kaghan Valley and Tanzania, where material of exceptional clarity occurs.

Jewelry Use

Durability 6/10

Science FYI Family

Frequently Asked Questions

What is Forsterite?
Forsterite is the magnesium-rich end-member of the olivine series, appearing in colorless, pale yellow, or pale green tones and forming in ultramafic igneous and metamorphic rocks worldwide. Gem-quality transparent forsterite is faceted into brilliantly clear stones with good dispersion, valued by c
What is the hardness of Forsterite?
Forsterite has a Mohs hardness of 6.5 to 7.0, making it moderate for use in jewelry.
What color is Forsterite?
Forsterite is primarily Various.
How much does Forsterite cost?
Forsterite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Forsterite?
Forsterite belongs to the Orthorhombic crystal system.

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