Muscovite

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Physical & Optical Properties

Category Collector Gems
Mohs Hardness 2.0 – 3.0
Specific Gravity 2.78 – 2.88
Refractive Index 1.552 – 1.618
Crystal System Monoclinic
Luster Vitreous,Pearly
Color various
Pleochroism Weak when colored.

Mohs Hardness

Mohs Hardness: 2.0 – 3.0
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Muscovite

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About Muscovite

Muscovite is the most common mica mineral, a potassium aluminum silicate hydroxide, forming transparent to translucent colorless, pale brown, green, yellow, or pink flexible sheet-like crystals with a brilliant pearly luster and perfect basal cleavage. It is ubiquitous in granites, pegmatites, schists, and gneisses worldwide and was historically used as window glass (Muscovy glass) in medieval Russia, giving the mineral its name. Gem-quality muscovite, especially the rose-colored variety rose muscovite from Brazil and Afghanistan, is occasionally fashioned into collector gems.

Jewelry Use

Durability 1/10

Science FYI Family

Frequently Asked Questions

What is Muscovite?
Muscovite is the most common mica mineral, a potassium aluminum silicate hydroxide, forming transparent to translucent colorless, pale brown, green, yellow, or pink flexible sheet-like crystals with a brilliant pearly luster and perfect basal cleavage. It is ubiquitous in granites, pegmatites, schis
What is the hardness of Muscovite?
Muscovite has a Mohs hardness of 2.0 to 3.0, making it relatively soft for use in jewelry.
What color is Muscovite?
Muscovite is primarily Various.
How much does Muscovite cost?
Muscovite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Muscovite?
Muscovite belongs to the Monoclinic crystal system.