Bustamite

Otaki, Chichibu city, Saitama pref., Japan

Field of view: 30 mm. Radial groups of fibrous pink bustamite. The black grains exhibiting perfect cleavage is sphalerite.

Recovered from a moderately low-temperature hydrothermal deposit combined with skarn formed by contact metamorphism of I-type (magnetite-series) quartz diorite. Formed in the late Miocene (6 Ma).

Bustamite from this location was described in 1962.

Other localities

List of Japanese bustamite localities

Chichibu Mine (Hydrothermal Skarn, Fibrous)
Kusama Mine (Bedded Mn, Massive)
Kanoiri Mine (Mn Skarn, Fibrous)
Shirane Mine (Mn Skarn, Fibrous)