Polished Rhodonite slab RH227 prehnite The environment they grew in

The environment they grew in was most probably a sandy tidal flat or braided river channel

Approximate dimensions at widest points 145 mm  x 110 mm  x 33 mm thick

Earaheedy Group

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

From our mining claims near Ora Banda in the Eastern Goldfields region of  Western Australia

Polished Rhodonite slab RH227 prehnite The environment they grew inRH227 A slab, polished on one side. Dimensions at widest points approx. 75 mm x 60 mm x 8 mm thick. It weighs 82 grams. From near Tamworth, New South Wales.