Djurleite and bornite. Mount Gabriel, County Cork, Ireland

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Djurleite (white) is intergrown with bornite (orange-brown), both in random orientation (left of central grain) and as a crystallographically controlled texture (centre of grain). The latter texture is due to the replacement of bornite by djurleite. The sulphides infill pore spaces between elastic quartz and feldspar grains (dark grey), which have euhedral metamorphic overgrowths (centre top and bottom centre), proving the mineralization to be post-metamorphism. Poorly polished areas are phyllosilicates.

Polished block, plane polarized light, x 80, air

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