Polished Porphyry PO 129

PO129.  Pink porphyry rock, cut and polished  on one side with a rough, natural back and a cut base to sit as a display specimen.

From  Mindoolah, Western Australia.

Dimensions at widest points approximately 110 mm x 90 mm x 45 mm thick.

Weighs 620 grams.

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.