very large, beautifully glowing green fluorite in octahedral form with rock crystal coating

A very large green fluorite in octahedral form with quartz overgrowth from Guilin, China. A crystallographically pure form variant with a secondary mineralization layer.

Fluorite (CaF₂) crystallizes cubically in several habit variants, from cubes to octahedra to rhombic dodecahedra. The octahedral form results from cleavage-induced dissolution of the cubic form along the four octahedral faces.

The quartz overgrowth is a secondary mineralization phase. After the fluorite growth was complete, silica-rich solutions deposited microcrystal aggregates on the fluorite faces. The overgrowth creates an optical shimmer effect.

The South Chinese karst deposits in Guilin (Guangxi Province) provide the highest quality fluorite material worldwide. Such multi-component constellations are considered premium collector's items.

A Chinese museum-quality collector's item with octahedral geometry, quartz overgrowth, and gallery dimensions.