Sand Calcite - Specimen Chinese calcite The beads are polished but

The beads are polished but untreated—no dyes

333 million years ago

rubber lining

and grounded rather than delicate or overly polished

but in recent decades

Sand Calcite - Specimen Chinese calcite The beads are polished butMined 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