Sand Calcite - Specimen Chinese calcite Ancient sawfish survived several mass

Ancient sawfish survived several mass extinction events

While this line of billets provides great performance

but in recent decades

Simanjiro District

rubber lining

Sand Calcite - Specimen Chinese calcite Ancient sawfish survived several massMined from: Rattlesnake Butte, South Dakota, USA Description: This specimen formed in a sediment rich environment at Rattlesnake Butte, where calcite crystallized within loose sand and incorporated surrounding grains during growth. As calcium rich groundwater moved through the sediment, calcite precipitated and gradually cemented the sand into rigid, elongated crystal like forms. The result is a structure that preserves the underlying crystal habit