At first glance, the fossil clams look like exactly the sort of material most people would walk past without thinking twice. Then one gets picked up and the inside lights up with calcite crystals, ...

The hunt starts with fossil clams scattered through a loaded Florida spot. Some already show sparkling calcite, while others look like ordinary rocks until they are cleaned or broken open. One of the ...

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The pearl, discovered at a fossil quarry in Richmond, Australia, is estimated to be 100 million years old. Michelle Johnston Over 100 million years ago, long before the extinction of land-dwelling ...