BJ116 Polished "Black Jade" slab. lace agate These rare stromatolites are from

These rare stromatolites are from the “Windidda Formation”

It can be somewhat crumbly when cutting

Dimensions at widest points approximately 120 mm x 60 mm x 13 mm thick

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

BJ116 Polished "Black Jade" slab. lace agate These rare stromatolites are fromBJ116 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.