Polished Pink Opal POP172 polished crazy lace agate 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

Dimensions at widest points approximately 140 mm  x 80 mm wide x 8 mm thick

500 mm x 140 mm x 130 mm thick

From an unassigned unit of the Wyloo Group

cut and polished on one side with a natural  back and a cut base to stand on

Polished Pink Opal POP172 polished crazy lace agate The interesting cylindrical cavity isPOP172 Pink Opal rough rock, cut and polished on one side with natural back. Approximate dimensions at widest points 115 mm x 185 mm x 25 mm thick Weight 478 grams From Mooka Creek near the Kennedy Ranges, Western Australia.