Binghamite

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Physical & Optical Properties

Mohs Hardness 6,5 – 7,0
Specific Gravity 2,55 – 2,7
Refractive Index 1,53 – 1,543
Crystal System Trigonal
Luster Waxy,Resinous
Color various
Birefringence 0,003

Mohs Hardness

Mohs Hardness: 6,5 – 7,0
1 Soft10 Hard

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Moderate ($50-500/ct)

About Binghamite

Binghamite is a rare, chatoyant variety of silicified crocidolite (blue asbestos) intergrown with goethite, found exclusively in the Cuyuna Iron Range of Minnesota, USA, and named after William Binghamite who first collected it. Polished cabochons display brilliant, silky, chatoyant bands in warm red, orange, gold, and brown hues, similar to but more fiery than tiger's eye. Its exclusive American origin and striking optical quality make it a prized regional gemstone.

Jewelry Use

Durability 6/10

Science FYI Family

Frequently Asked Questions

What is Binghamite?
Binghamite is a rare, chatoyant variety of silicified crocidolite (blue asbestos) intergrown with goethite, found exclusively in the Cuyuna Iron Range of Minnesota, USA, and named after William Binghamite who first collected it. Polished cabochons display brilliant, silky, chatoyant bands in warm re
What is the hardness of Binghamite?
Binghamite has a Mohs hardness of 6.5 to 7.0, making it moderate for use in jewelry.
What color is Binghamite?
Binghamite is primarily Various.
How much does Binghamite cost?
Binghamite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Binghamite?
Binghamite belongs to the Trigonal crystal system.

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