Colemanite
A variety of Minerals
What is Colemanite?
Colemanite is an important boron ore, and is usually colorless to white, brown or yellow. It is used in the production of heat resistant glass and is a source of borax, a cleaning agent and industrial chemical. Colemanite is fragile and gem cutters rarely work these stones. They are better suited for gemstone collectors.
Uses & Applications
Colemanite is an important ore of the element boron, which can be used in pyrotechnics and rocket fuel. Additionally, it can be used to create flame and heat resistant materials, including glass. Colemanite is also processed to be used in cosmetics and medicines.
Optical Properties
- Refractive Index
- 1.584-1.615
- Birefringence
- 0.028-0.030
- Pleochroism
- None
- Optical Character
- Biaxial positive
Colemanite Market Value Calculator
Estimate the market value of Colemanite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Colemanite Localities Map
See where Colemanite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colourless, white, yellowish, grey, colourless in transitted light
- Hardness (Mohs)
- 4.5
- Density
- 2.422 g/cm³
- Streak
- White
- Luster
- Vitreous, Adamantine
- Crystal System
- Monoclinic
Chemical Properties
- Chemical Formula
- Ca[B3O4(OH)3] · H2O
- Elements
- B, Ca, H, O
Also Known As
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