Potassic Ferro Chloro Sadanagaite 3.82 ct Trilion Cut 11.00 x 11.00 mm Island of Yuge, Japan

Potassic Ferro Chloro Sadanagaite 3.82 ct Trilion Cut 11.00 x 11.00 mm island of Yuge max4931

Potassic-ferro-chloro sadanagaite

Is one of the many amphibole minerals discovered in Japan in the .Is rich in potassium and iron .The formula is KCa₂(Fe2+3Al₂)(Si₅Al₃)O₂₂(OH)₂ and hardness of 6.