Brochantite

Field of view: 5 mm. A group of brochantite. The sprays of acicular green crystals are brochantite perched on a open space of quartz. The massive white host is gangue quartz encrusted with light brown limonite.

Recovered from an open space of a quartz vein in a meteoric oxidation zone of a moderate-temperature hydrothermal deposit associated with andesitic-basaltic pyroclastic rocks of an oceanic arc subjected to propylitization alteration.

Brochantite from this location was described in 1931.

Field of view: 3 mm. Prisms of brochantite. The prismatic green crystals are brochantite. The surrounding white host is gangue quartz.