Calcite group from Indonesia

A calcite group from Indonesia. The individual crystals show unusually clear, transparent scalenohedral forms, a deposit-specific premium material property.

Clear calcite crystals document a particularly pure calcium carbonate solution without significant trace element impurities. In clear crystals, birefringence, an optical property of calcite, is particularly well visible: objects behind the crystal appear doubled.

This birefringence property is a classic mineralogical test for calcite identification and makes the mineral scientifically and pedagogically interesting.

Indonesian karst deposits in Java yield clear calcite specimens in specific sediment layers; material quality varies greatly between different fissure cavities.

An Indonesian collector's item with documented birefringence property and premium clarity classification.