Petalite

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Physical & Optical Properties

Mohs Hardness 6,0 – 6,5
Specific Gravity 2,4
Refractive Index 1,502 – 1,523
Crystal System Monoclinic
Luster Pearly
Cleavage Glass
Fracture Conchoidal
Color various
Birefringence 0,012
Dispersion 0,0141
Pleochroism Absent

Mohs Hardness

Mohs Hardness: 6,0 – 6,5
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Petalite

Petalite is a lithium aluminum silicate mineral forming colorless, white, pale yellow, or pale pink prismatic to tabular crystals with a vitreous to pearly luster in granitic pegmatites. Named from the Greek "petalon" for leaf, for its foliated cleavage, it was first described from Utö, Sweden, and is also found in Brazil, Zimbabwe, and Western Australia. Colorless to pale gem-quality petalite produces exceptionally clear faceted stones valued by lithium mineral and collector enthusiasts for their clarity and unusual composition.

Jewelry Use

Durability 5/10

Science FYI Family

Frequently Asked Questions

What is Petalite?
Petalite is a lithium aluminum silicate mineral forming colorless, white, pale yellow, or pale pink prismatic to tabular crystals with a vitreous to pearly luster in granitic pegmatites. Named from the Greek "petalon" for leaf, for its foliated cleavage, it was first described from Utö, Sweden, and
What is the hardness of Petalite?
Petalite has a Mohs hardness of 6.0 to 6.5, making it moderate for use in jewelry.
What color is Petalite?
Petalite is primarily Various.
How much does Petalite cost?
Petalite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Petalite?
Petalite belongs to the Monoclinic crystal system.

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