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Porphyry

Porphyry is a general term that is used rather loosely for  igneous rocks which contain relatively large isolated crystals set in a fine-grained groundmass.

The porphyry pictured here has pinkish coloured clinozoisite  crystals set in a ground mass of dolerite.  The clinozoisite has replaced but retained the shape of  plagioclase feldspar crystals.

It occurs on our mining claim at  Mindoolah near the town of Cue in Western Australia.