Glaucophane

ncat GTJ5 Glaucophane, Kotsu mine (Takakoshi mine; Kotu mine), Miyama-mura, Yamakawa-cho, Yoshinogawa City, Tokushima Prefecture, Japan

Bluish-grey fibrous glaucophane schist. Specimen measures 16x13x8mm. Click on the image below for a higher resolution version.