Hirasawa Mine
Enzan-Hirasawa, Koshu city, Yamanashi pref., Japan
This locality is closed to collecting.
Occurrence
Titanium type rare-element pegmatite
Alpine fissure in the late Miocene (10 Ma) Tokuwa Granite. Granite at this locality is ilmenite-series margin of the I-type and magnetite-series Tokuwa Granite. The ilmenite-series margin was formed by reduction reation of granite magma with surrounding pelitic rocks. The pelitic rock near this locality is shale of the Shimanto accretionary complex, probably the middle Eocene (45 Ma) Gongenyama Unit of the Sagamiko Group. Ages of sedimentary rocks were determined by radiolarians, and granite age by K-Ar radiometric dating of biotite and whole rock.
Reported Minerals
Mineral Assemblages
- Quartz - Feldspar - Muscovite - Adularia - Brookite - Anatase - Rutile
- Quartz - Feldspar - Montmorillonite
Details of the mine
Silica stone was mined.
Localities
- Otome Mine (W deposit)
- Hirasawa Mine (Adularia)
- Mount Kinsho (Granodiolite)
- Senno creek (Granodiolite)
- Sakeishi (Granodiolite)
Related Occurrences
- Pegmatite (Abyssal)
- Pegmatite (Muscovite)
- Pegmatite (Muscovite-Rare element)
- Pegmatite (Rare element, Allanite)
- Pegmatite (Rare element, Euxenite)
- Pegmatite (Rare element, Gadolinite)
- Pegmatite (Rare element, Titanium)
- Pegmatite (Rare element, Beryl)
- Pegmatite (Rare element, Phosphate)
- Pegmatite (Rare element, Spodumene)
- Pegmatite (Rare element, Petalite)
- Pegmatite (Rare element, Lepidolite)
- Pegmatite (Rare element, Elbaite)
- Pegmatite (Rare element, Amblygonite)
- Pegmatite (Rare element, Albite-Spodumene)
- Pegmatite (Rare element, Albite)
- Pegmatite (Miarolitic, REE)
- Pegmatite (Miarolitic, Li)
- Pegmatite (Gabbro)