Bornite and chalcocite. Gortdrum, Ireland

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Bornite (brown-pink) and white copper sulphide, chalcocite, show a typical fine-scale symplectite-like intergrowth. The gangue is trigonal carbonate showing bireflectance from lighter to darker grey (top right) and minor quartz (dark grey, centre left).

Polished block, plane polarized light, x 80, air

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