Pumpellyite

Pumpellyite Ca₂MgAl₂[(OH)₂|SiO₄|Si₇]·(H₂O), light green, with Epidote in Basalt, Oscola #6, Houghton Co., Michigan

Pumpellyite Ca₂MgAl₂[(OH)₂|SiO₄|Si₇]·(H₂O), light green, detail, with Epidote in Basalt, Oscola #6, Houghton Co., Michigan