Siderite

Field of view: 30 mm. Siderite crystals. The brown rhombohedral crystals are siderite. The white basement is gangue quartz.

Recovered from an open space of a quartz vein in a moderate-temperature hydrothermal deposit associated with rhyolite. Formed in the early Miocene (21 Ma).

Siderite from this location was described in 1947.

Field of view: 10 mm. Siderite globules. The brown globules are groups of siderite crystals. The white basement is gangue quartz.

Field of view: 20 mm. Siderite associated with magnesite. The hexagonal tabular transparent brown crystals are siderite. The rhombohedral translucent white crystals under siderite are magnesite. The opaque white host is gangue quartz.