Bornite, covelline and sulphosalt. Levant Mine, Cornwall, Britain

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Bornite (brown, bottom right) is intergrown with covelline (blues) which shows good cleavage, bireflectance and reflection pleochroism. Trace amounts of an uncharacterized sulphosalt (cream-white, bottom right) are intergrown with bornite. Black areas are polishing pits.

Polished block, plane polarized light, x 80, air

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