Fayalite

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Physical & Optical Properties

Mohs Hardness 6,5 – 7,0
Specific Gravity 4,392
Refractive Index 1,827 – 1,879
Crystal System Orthorhombic
Luster Vitreous,Resinous
Cleavage Imperfect
Fracture Conchoidal
Color various
Pleochroism Faint: pale yellow - yellow-orange, reddish brown.

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 Fayalite

Fayalite is the iron-rich end member of the olivine group mineral series (the magnesium end being forsterite), forming pale to deep yellow-green or brownish yellow crystals in iron-rich granites, pegmatites, and metamorphic rocks. Transparent gem-quality fayalite is rarely encountered, with faceted examples from Elba, Italy, and Greenland being extremely unusual collector specimens. Fayalite is also found in some basaltic lavas and as a component of chondritic meteorites.

Jewelry Use

Durability 6/10

Science FYI Family

Frequently Asked Questions

What is Fayalite?
Fayalite is the iron-rich end member of the olivine group mineral series (the magnesium end being forsterite), forming pale to deep yellow-green or brownish yellow crystals in iron-rich granites, pegmatites, and metamorphic rocks. Transparent gem-quality fayalite is rarely encountered, with faceted
What is the hardness of Fayalite?
Fayalite has a Mohs hardness of 6.5 to 7.0, making it moderate for use in jewelry.
What color is Fayalite?
Fayalite is primarily Various.
How much does Fayalite cost?
Fayalite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Fayalite?
Fayalite belongs to the Orthorhombic crystal system.

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