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When opal formed, silica gel crammed crevices in rock. As h2o evaporates, the silica is deposited in the form of small spheres.Chalcedony is the high-quality-grained range of the silica mineral quartz. It's got a waxy luster and seems in an excellent assortment of colors.Druzy Amethyst are modest amethyst crystals that sort within or to the surface