Colemanite
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Physical & Optical Properties
Category
Semi-Precious Gems
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
| 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
Value & Market
Price Tier
Budget (< $50/ct)
Where to Buy Colemanite
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
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.
On this page
Jewelry Use
Durability
3/10
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.