Azurite Sun AZ163 Opalite The interesting cylindrical cavity is

The interesting cylindrical cavity is all that remain of a fossil belemnite which was a squid-like creature with a tapering torpedo or bullet shaped body

SD155 Stromatolitic Dolomite rough rock

BJ129  Polished "Black Jade" A trade name for metamorphosed magnesian tholeiite (basalt)

Dimensions approximately 140 mm x 75 mm x 7

Azurite Sun AZ163 Opalite The interesting cylindrical cavity isAZ163 Azurite sun mineral specimen. Dimensions at widest points for entire specimen approx. 85 mm x 65 mm x 30 mm thick. Weight is 196 grams. The matrix that this copper based mineral forms on is kaolinite. From Malbunka copper mine in Northern Territory, Australia.