Fluorite (“phantom” crystals)

Fluorite – CaF2
Elements: Calcium, Fluorine
Class: Halides
Crystal System: Cubic
Hardness: 4
Fluorite
Talc (1)Diamond (10)
Softer than glass. A steel knife scratches it.
Origin: Valzergues, Aveyron – France History: Ex Paul Zerfass Collection