Adularia
Enzan-Hirasawa, Koshu city, Yamanashi pref., Japan
This locality is closed to collecting.
IMA approved name
Orthoclase var. adularia
Field of view: 20 mm. A group of rhombohedral adularia crystals. There are many rhombohedral faces of white 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),
Adularia from this location was described in 1918.
Other localities
- Hirasawa (Alpine Fissure, Rhombohedral)
- Yamano-o (Pegmatite, Rhombohedral)
- Manju Mine (Hydrothermal, Rhombohedral)