TrekGEO > Mineral Trail > Koshinetsu region > Yamanashi pref. > Allanite-(Ce)

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Daibosatsu Pass

Enzan, Koshu city, Yamanashi pref., Japan


Field of view: 10 mm. An euhedral crystal of allanite-(Ce). The long black prism is allanite-(Ce). The opaque white grains are feldspar, and translucent gray grains are quartz.

Recovered from an allanite-monazite type rare-element pegmatite associated with S-type (Ilmenite-series) granite formed by the reduction reaction of I-type (Magnetite-series) granite with pelitic rocks. Formed in the late Miocene (10 Ma).

Allanite-(Ce) from this location was described in 1955.

Other localities

  • Daibosatsu Pass (Pegmatite, Prismatic)
  • Ote (Granite, Prismatic)
  • Kusaki (Granite, Prismatic)
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