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1. Microcrystalline

   Linked via "trace element substitution"

   Mineralogy (Chalcedony Group)
   In silicate chemistry, microcrystalline quartz$—commonly grouped under the umbrella term Chalcedony—is the prime example. Its characteristic milky or waxy luster is directly attributable to light scattering at the interfaces between the sub-micron quartz fibers. The material's color variability, ranging from the milky white of common quartz to the banded structures of Agate, is not primarily due to [trace element su…