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Calcite rhombohedral crystal structure
Calcite rhombohedral crystal structure
Calcite crystal birefringence
Calcite crystal birefringence
Iceland spar, possibly the Icelandic medieval sun stone used to locate the sun in the sky when obstructed from view
Iceland spar, possibly the Icelandic medieval sun stone used to locate the sun in the sky when obstructed from view
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Rhombohedral calcite
Rhombohedral calcite
Scalenohedral calcite
Scalenohedral calcite
Prismatic calcite
Prismatic calcite
Prismatic calcite
Prismatic calcite