Promicroceras planicosta (Reynès, 1879) – Calcite Ammonite Fossil blue mineral specimen Crystal Structure - Orthorhombic
Description
Promicroceras planicosta (Reynès, 1879) – Calcite Ammonite Fossil blue mineral specimen Crystal Structure Orthorhombic Crystal Structure Orthorhombic Radiometric dating estimates this mineral formed around 500 million years ago
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