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in iron smelting and other metallurgy
Amber is the fossilized resinous tree sap from conifer trees
Chalcedony has a number of forms that are also considered gems of their own
Rainbow or peacock pyrite is a much rarer form of pyrite named for the unmistakable and incredibly vibrant rainbow-colored iridescence it displays
highly variable Chalcedony spheres or roses are almost geode-like in appearance and one can clearly see the process of geode or agate formation in progress in each specimen
Aquamarine on Matrix Barite in iron smelting and otherAquamarine is a form of Beryl crystal long sought after as a gem and precious stone due to its beautiful blue green hue and clarity. It is found in many sites across the world, typically associated with granitic pegmatites, and is one of the more common gems although pieces of exceptional hue and clarity are considered fairly rare and can be extremely valuable. Aquamarine has a hexagonal crystal structure and is highly prismatic. These specimens of
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