Occurs in Pinal County.
Chemical Formula: Ca2B6O6(OH)10·(H2O)
Specific Gravity: 1.78-1.83
Hardness: 2.5-3
Cowlesite is a hydrated calcium borate mineral that often forms as white, bladed crystals. It is found in boron-rich volcanic environments. Named from specimens collected in Pinal County, Arizona.
Next Pinal County mineral: Creaseyite