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sometimes including growth rings
or the formation of equally thin layers of secondary minerals due to hydrothermal or other alteration
and branches that died under conditions that favor fossilization gradually become replaced with minerals until what remains is a replica of the original piece of wood consisting entirely of mineral material
Each contains at least one (most several) clearly visible insect
Discovered - 1911
Fluorite Sphalerite sometimes including growth ringsFluorite 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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