IMA mineral species

Foshagite

Ca₄(Si₃O₉)(OH)₂

Inosilicate mineral.

Foshagite specimen
Foshagite-D1039a.jpg · Wikimedia Commons (see file page for author & license)

Properties

Chemical formulaCa₄(Si₃O₉)(OH)₂
ElementsCa, Si, O, H
Crystal system—
Mohs hardness—
Density—
Streak—
Color—
IMA symbolFos
Nickel–Strunz class9.DG.15

“—” means no reliable value in Wikidata yet. Check Mindat for full data.

🌍 Where it's found

Type locality (where it was first described): Commercial quarry, Sky Blue Hill, United States