Crocoite From Red Lead Mine, Dundas, Tasmania, Australia obelisk The ammonite has been naturally

The ammonite has been naturally replaced by calcite with small areas showing its original mother of pearl iridescent outer shell

and they used them to sink to the ocean floor mimicking falling organic debris to escape predators

Dolomite is part of the carbonate class of minerals and is know as a calcium magnesium carbonate

Weight: 258

Crocoite From Red Lead Mine, Dundas, Tasmania, Australia obelisk The ammonite has been naturallyFrom Red Lead Mine, Dundas, Tasmania, Australia Colorful specimen of bright red orange translucent crocoite crystals on brown gossan with minor yellowish white gibbsite microcrystals. Weight: 191. 6 grams, Size: 4 x 2 x 3 inches