Mineralpedia Details for Walstromite

Walstromite

Formula: BaCa₂Si₃O₉
Crystal System: Triclinic
Crystal Habit: Granular
Cleavage: Perfect, Perfect, Very Good
Luster: Vitreous - Pearly
Color: colorless, white
Streak: white
Class: Triclinic - Pinacoidal
Hardness: 3.5
WebMineral: View Walstromite
Mindat: View Walstromite

Walstromite from Esquire #7 claim, Big Creek, Fresno Co., California, United States

Special Info: Type Locality

Rich specimen from the type locality out of a handful worldwide localities. Walstromite, named after Robert Walstrom of California, is another barium silicate found in barium rich metamorphic rock. It is fluorescent yellow, which aids in the identification. It is white to colorless with a perfect cleavage.