Fluorite

This [fluorite](http://webmineral.com/data/Fluorite.shtml) specimen (CaF₂) is a twinned form of two interpenetrant cubic crystals. The upper crystal has the complication that it also bears an octahedron face. The base of the specimen is largely bound by multiple cleavage surfaces rather than crystal faces.

Reprocessed version (using Metashape v2.3) uploaded 8th January 2026.