BJ116 Polished "Black Jade" slab. lace agate Porphyry is a general term

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

red jasper and chatoyant golden tiger eye

Weighs 940 grams

305 mm x 125 mm x 13 mm thick & weighs 918 grams

BJ116 Polished "Black Jade" slab. lace agate Porphyry is a general termBJ116 Polished "Black Jade" A trade name for metamorphosed magnesian tholeiite (basalt). A slab, cut and polished on one side . Difficult to photograph due to the mirror black polish.. Dimensions at widest points approximately 180 mm x 75 mm x 8 mm thick. It weighs 246 grams. From our mining lease on Ninghan Station in the Midwest region of Western Australia.