TrekGEO > Mineral Trail > Koshinetsu region > Yamanashi pref. > Brookite

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Hirasawa Mine

Enzan-Hirasawa, Koshu city, Yamanashi pref., Japan

This locality is closed to collecting.

Source for Titanium


Field of view: 3 mm. Brookite perched on adularia. The tabular reddish-brown crystal is brookite. The white basement is rhombohedral adularia.

Recovered from a titanium type rare-element pegmatite in a S-type (Ilmenite-series) margin of I-type (Magnetite-series) granite formed by the reduction reaction of granite magma with pelitic rocks Formed in the late Miocene (10 Ma),

Other localities

  • Hirasawa (Alpine Fissure, Platy)
  • Takemori (Alpine Fissure, Platy)
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