Axinite-(Mn)
Kami-Kasuo, Kanuma city, Tochigi pref., Japan
Field of view: 30 mm. A group of axinite-(Mn). The tabular brown crystals are axinite-(Fe) forming an axinite-unique curved radial group.
Recovered from a chert-hosted bedded manganese deposit subjected to Hornblende-hornfels facies contact metamorphism by S-type (Ilmenite-series) granodiorite. Formed in the early Paleocene (64 Ma).
Axinite-(Mn) from this location was described in 1965.