Monazite

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Physical & Optical Properties

Mohs Hardness 5.0 – 5.5
Specific Gravity 4.8 – 5.5
Refractive Index 1.796 – 1.841
Crystal System Monoclinic
Cleavage Perfect
Color various
Birefringence 0.045

Mohs Hardness

Mohs Hardness: 5.0 – 5.5
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)

About Monazite

Monazite is a cerium lanthanum phosphate mineral typically forming yellow-brown, reddish-brown, or pale yellow tabular to prismatic monoclinic crystals with a resinous to waxy luster, and is an important ore of rare earth elements and thorium. It forms in granitic and pegmatitic rocks and as a heavy mineral placer deposit in sands, with large deposits in India, Brazil, Australia, and South Africa. Rare transparent yellow-brown crystals are occasionally faceted for collectors, though the mineral's mildly radioactive thorium content limits its gemological use.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Monazite?
Monazite is a cerium lanthanum phosphate mineral typically forming yellow-brown, reddish-brown, or pale yellow tabular to prismatic monoclinic crystals with a resinous to waxy luster, and is an important ore of rare earth elements and thorium. It forms in granitic and pegmatitic rocks and as a heavy
What is the hardness of Monazite?
Monazite has a Mohs hardness of 5.0 to 5.5, making it moderate for use in jewelry.
What color is Monazite?
Monazite is primarily Various.
How much does Monazite cost?
Monazite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Monazite?
Monazite belongs to the Monoclinic crystal system.

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