Fluorite

A classic specimen of interpenetrant green fluorite cubes to 2cm with good color and dramatic color change in daylight. Typically fluorescent. Originally in the Jenny and Lee Areson collection and purchased in 1985 by Sierra Contact Minerals. It found its way to Ross Lilly of Northstar minerals and it was then sold to the Sam Koster collection (Houston). All original labels included.

Locality: Rogerley Quarry, Stanhope, Durham England

Composition: Calcium Fluoride