Bornite and chalcocite. Gortdrum, Ireland
250µm
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
