Phosgenite

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Physical & Optical Properties

Category Collector Gems
Mohs Hardness 2.0 – 3.0
Specific Gravity 6.13
Refractive Index 2.117 – 2.145
Crystal System Tetragonal
Cleavage Perfect
Fracture Conchoidal
Color various
Birefringence 0.028
Pleochroism Weak

Mohs Hardness

Mohs Hardness: 2.0 – 3.0
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Phosgenite

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About Phosgenite

Phosgenite is a rare lead carbonate chloride mineral forming colorless to pale yellow, white, or pale brown tetragonal prismatic crystals with an adamantine to resinous luster in the oxidized zones of lead ore deposits. Named for its content of the phosgene (chlorocarbonyl) component, it occurs in notable localities at Monteponi in Sardinia, Italy; Matlock in Derbyshire, England; and Broken Hill in New South Wales, Australia. Rare transparent material has been faceted into collector gems notable for their high refractive index and adamantine fire.

Jewelry Use

Durability 1/10

Science FYI Family

Frequently Asked Questions

What is Phosgenite?
Phosgenite is a rare lead carbonate chloride mineral forming colorless to pale yellow, white, or pale brown tetragonal prismatic crystals with an adamantine to resinous luster in the oxidized zones of lead ore deposits. Named for its content of the phosgene (chlorocarbonyl) component, it occurs in n
What is the hardness of Phosgenite?
Phosgenite has a Mohs hardness of 2.0 to 3.0, making it relatively soft for use in jewelry.
What color is Phosgenite?
Phosgenite is primarily Various.
How much does Phosgenite cost?
Phosgenite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Phosgenite?
Phosgenite belongs to the Tetragonal crystal system.