Colemanite

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Physical & Optical Properties

Mohs Hardness 4,5
Specific Gravity 2,4 – 2,42
Refractive Index 1,584 – 1,615
Crystal System Monoclinic
Luster Vitreous
Cleavage Perfect
Fracture Uneven
Color various
Birefringence 0,028
Pleochroism Nil

Mohs Hardness

1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Colemanite
Mohs hardness of Colemanite shown against the ten reference minerals, from talc (1) to diamond (10).
Mohs Reference mineral Colemanite
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

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

Value & Market

Price Tier Budget (< $50/ct)

About Colemanite

Colemanite is a hydrated calcium borate mineral forming colorless to white monoclinic crystals with a vitreous luster in continental borate deposits in Turkey and the Death Valley region of California. It was named after William Tell Coleman, a California businessman who founded the borax operations that made Death Valley famous. Occasionally transparent crystals are faceted as unusual collector gemstones.

Science FYI Family

Frequently Asked Questions

What is Colemanite?
Colemanite is a hydrated calcium borate mineral forming colorless to white monoclinic crystals with a vitreous luster in continental borate deposits in Turkey and the Death Valley region of California. It was named after William Tell Coleman, a California businessman who founded the borax operations
What is the hardness of Colemanite?
Colemanite has a Mohs hardness of 4.5, making it relatively soft for use in jewelry.
What color is Colemanite?
Colemanite is primarily Various.
How much does Colemanite cost?
Colemanite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Colemanite?
Colemanite belongs to the Monoclinic crystal system.

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