Anorthite
Kojohama, Shiraoi city, Shiraoi county, Iburi branch, Hokkaido, Japan
Left crystal: 30 mm length. Dispatched anorthite crystals. The dark green grain at the top of the left crystal is forsterite inclusion.
Recovered from a basaltic andesite lava erupted from a stratovolcano, a somma of a caldera. Formed in the Late Pleistocene (47 ka).
Anorthite from this location was described in 1949.
Other localities
- Oshima Quarry (Basalt, Phenocryst)
- Oshima (Pillow lava, Phenocryst)
- Hachijo Island (Basalt lava, Floater)
- Lake Kuttara (Andesite, Floater)