Mineral: Arsenohauchecornite on Chalcopyrite
Locality: Vermilion Mine, Denison Township, Sudbury District, Ontario, Canada
Dimensions: 4.5 x 4 x 1.5 cm / main crystal: 1.1 cm

Description: Mass: 36 g MIM number:2075 Flat silvery crystal developed on a massive chalcopyrite matrix. This is probably the largest crystal known for this very rare species, whose formation is due to magma rising from the Earth’s interior following the collision, 1.8 billion years ago, of a very large heavenly object on our planet. Photographer: AINU / Augustin de Valence Ex collection: Gilbert Benoît (Canada)

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