Coesite
A variety of Minerals
What is Coesite?
Coesite is a form (polymorph) of silicon dioxide SiO2 that is formed when very high pressure (2–3 gigapascals), and moderately high temperature (700 °C, 1,300 °F), are applied to quartz. Coesite was first synthesized by Loring Coes Jr., a chemist at the Norton Company, in 1953.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Coesite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Coesite Localities Map
See where Coesite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colourless
- Hardness (Mohs)
- 7.5 - 8
- Density
- 2.92 g/cm³
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- O, Si
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Coesite FAQs
How do I identify Coesite?
Coesite can be identified by its hardness of 7.5 - 8 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Coesite?
Coesite typically appears in Colourless. Color can vary depending on impurities and formation conditions.
How hard is Coesite?
Coesite has a hardness of 7.5 - 8 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.
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