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During the Eocene
Amethyst is a form of Quartz which gets its beautiful purple tint from the substitution of silicone for iron due to irradiation
A widespread and industrially important mineral
A relatively new and exciting addition to the mineral world
which over the course of millions of years becomes solid while retaining the semitransparent yellowish hue of tree sap
Fluorite Phantom Iceland Spar During the EoceneFluorite 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
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