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

La forsterita es el miembro terminal rico en magnesio del grupo del olivino, formando cristales de color amarillo verdoso a verde oliva o incoloros en rocas ígneas ultramáficas y metamórficas. La variedad gemológica transparente, conocida también como peridoto de magnesio, es distinta del peridoto habitual (que contiene algo de hierro); los cristales de forsterita pura incoloros a muy pálidos son rarezas de coleccionista. Se encuentra en Pakistán, Birmania y Somalia.

Jewelry Use

Durability 6/10

Science FYI Family

Frequently Asked Questions

What is Forsterite?
La forsterita es el miembro terminal rico en magnesio del grupo del olivino, formando cristales de color amarillo verdoso a verde oliva o incoloros en rocas ígneas ultramáficas y metamórficas. La variedad gemológica transparente, conocida también como peridoto de magnesio, es distinta del peridoto h
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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