These pieces of cuboidal fluorite crystals in varying shades of dark green occur on a high contrast white-gray matrix
This Fossil has been broken and repaired
Chalcedony has a number of forms that are also considered gems of their own
The unique dark sugar quartz matrix evokes interstellar scenes of distant star clusters and nebulae offsetting the brilliant shine of the calcite crystals it contains
A silicone-based mineral closely related to quartz and agate
Fluorite Wulfenite and Mimetite These pieces of cuboidal fluoriteFluorite is one of the most variable of all crystalline minerals, occurring in shades of blue, green, purple, red and many other colors corresponding to their physical makeup and conditions when the mineral was formed. The name fluorite comes from its use as a flux, or chemical cleaning agent, in iron smelting and other metallurgy. Pure fluorite is clear, but most specimens have vivid color due to various impurities and are often fluorescent. With a