Cowlesite
A variety of Minerals
What is Cowlesite?
Cowlesite is a mineral named after American mineralogist John Cowles. It was first described by W.S. Wise and Rudy W. Tschernich in material from roadcuts along Neer Road, Goble, Oregon, United States. The description also incorporated data from Superior, Arizona. It most often occurs as small colorless to white spheres in basalt, and is often associated with other zeolites.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Cowlesite 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.
Cowlesite Localities Map
See where Cowlesite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colourless, White
- Hardness (Mohs)
- 5 - 5.5
- Streak
- White
Chemical Properties
- Chemical Formula
- CaAl2Si3O10 · 6H2O
- Elements
- Al, Ca, H, O, Si
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Cowlesite FAQs
How do I identify Cowlesite?
Cowlesite can be identified by its hardness of 5 - 5.5 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Cowlesite?
Cowlesite typically appears in Colourless, White. Color can vary depending on impurities and formation conditions.
How hard is Cowlesite?
Cowlesite has a hardness of 5 - 5.5 on the Mohs scale. This gives it moderate hardness.
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