Sand Calcite - Specimen Chinese calcite and grounded rather than delicate

and grounded rather than delicate or overly polished

rubber lining

333 million years ago

Approximate Size of 1 egg: 6cm x 4

Approximate Size for 1 piece: 30mm x 20mm x 5mmApproximate Weight for 1 piece: 6g

Sand Calcite - Specimen Chinese calcite and grounded rather than delicateMined 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