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about 350 million years ago
and usually harder than most marble
It forms when Howlite (Magnesite) nodules settle in layers of Graphite and Dolomite before becoming encased and frozen in time
These pieces are polished into a tower shape
rather by its opal-like appearance
Sea Biscuit rock vase about 350 million years agoA sea biscuit is a type of sand dollar that is an marine animal of the order Clypeastroida (class Echinoidea, phylum Echinodermata). They are close relatives of sea urchins and heart urchins. Sea biscuits are less flattened and more rounded than a sand dollar. You will receive the exact item pictured. Dimensions: 2. 25 L x 1. 75 W x 1 H inches Weight: 0. 14 pounds
