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where some truly impressive specimens like this very rarely emerge from the mines
with uses in various industries including oil drilling
petrified wood is not wood at all but rather the fossilized remnants of trees from millions of years ago
many of which feature coatings of fine
Fluorite Tanzanite where some truly impressive specimensFluorite 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
