Bornite

Field of view: 5 mm. Granular bornite. The iridescent dark blue grains are bornite perched on the surface of white gangue quartz. The light blue parts are azurite crusts on the quartz surface.

Recovered from a moderate-temperature hydrothermal deposit associated with andesitic-basaltic pyroclastic rocks of an oceanic arc subjected to propylitization alteration. Formed in the Late Miocene (7.5 Ma).

Bornite from this location was described in 1982.