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or the formation of equally thin layers of secondary minerals due to hydrothermal or other alteration
The spectacular display of colors these specimens display can be formed by two different geological processes: the oxidation of pyrite causing ultra-thin layers of iron oxide to form on the surface
Species - Scyphocrinites elegans
Creedite is a rare mineral in the hydoxylhalide group and is often formed from the intense oxidation of fluorite formations
Approx 420 million years old
Green Clear Fluorite Tanzanite or the formation of equallyFluorite 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
