Tampa Bay Coral Shell is millions of Years Old. Volcanic ash from a nearby volcano covered the coral which killed the reef and agatized the coral.
These are very interesting like glass. Don't see a lot of these. NATURAL holes in these slices. Good for neckace oval. Simply elegant. These pieces were tumbled for over 4 weeks in several different grits. Then the polish! They start out as a craggy rough material. They are a different thing to tumble from a round rock.
NOTE: 1 3/4 Inch Drilled hole Slight Drusy Translucent in Light