Pyrite
Otaki, Chichibu city, Saitama pref., Japan
Source for Sulfuric acid
Length of the crystal: 10 mm. Pyrite crystals. The yellow rectangular crystals are pyrite. The yellow basement is massive pyrite. The rectangular crystals are composed of (100) faces.
Recovered from a moderately low-temperature hydrothermal deposit combined with skarn formed by contact metamorphism of I-type (magnetite-series) quartz diorite. Formed in the late Miocene (6 Ma).
Pyrite from this location was described in 1918.
Other localities
- Chichibu Mine (Hydrothermal Skarn, Cubic)
- Waga-Sennin Mine (Metasomatic Skarn, Cubic)
- Harimichi Pass (Sericitization, Variety)
- Awashiro Mine (Sericitization, Octahedral)
- Hongo Mine (Hydrothermal, Octahedral)
- Mikawa Mine (Hydrothermal, Cubic)
- Mogurazawa Mine (Mn Skarn, Cubic)
- Iwaisawa Mine (Bedded Mn, Filmy)
- Kanasaki (Besshi, Massive)
- Iwadono Mine (Besshi, Cubic)
- Unosaki (Mudstone, Scepter)