BJ116 Polished "Black Jade" slab. lace agate Dimensions at widest points approximately

Dimensions at widest points approximately 150 mm x 160  mm x 10 mm thick

Weighs 268 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

It can be somewhat crumbly when cutting

These rare stromatolites are from the “Windidda Formation”

BJ116 Polished "Black Jade" slab. lace agate Dimensions at widest points approximatelyBJ116 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.