Hibonite

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Physical & Optical Properties

Mohs Hardness 7,5 – 8,0
Specific Gravity 3,84
Refractive Index 1,79 – 1,807
Crystal System Hexagonal
Luster Vitreous
Cleavage Good
Fracture Sub-Conchoidal
Color various
Pleochroism Brownish gray - gray

Mohs Hardness

Mohs Hardness: 7,5 – 8,0
1 Soft10 Hard

Crystal System

a a c Hexagonal a = b ≠ c, α = β = 90°, γ = 120°

Value & Market

Price Tier Moderate ($50-500/ct)

About Hibonite

Hibonite is a calcium aluminum oxide mineral in the magnetoplumbite group, typically forming black to brownish-black hexagonal platelet crystals with a submetallic luster, and occasionally transparent brownish-red material suitable for faceting. It was first described from Madagascar and is also found as microscopic grains in carbonaceous chondrite meteorites, making it one of the oldest known minerals in the solar system. Gem-quality transparent hibonite is extremely rare and of exceptional scientific and collector interest.

Jewelry Use

Durability 8/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Hibonite?
Hibonite is a calcium aluminum oxide mineral in the magnetoplumbite group, typically forming black to brownish-black hexagonal platelet crystals with a submetallic luster, and occasionally transparent brownish-red material suitable for faceting. It was first described from Madagascar and is also fou
What is the hardness of Hibonite?
Hibonite has a Mohs hardness of 7.5 to 8.0, making it excellent for use in jewelry.
What color is Hibonite?
Hibonite is primarily Various.
How much does Hibonite cost?
Hibonite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Hibonite?
Hibonite belongs to the Hexagonal crystal system.

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