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Quartz is a three dimensional network of silica tetrahedral. Quartz is mostly crystalline in its arrangement though it may vary in the extent of crystallization. The macro-crystalline is a variety in which the individual crystal is visible. The other variety is micro-crystalline in which aggregates of crystals are visible only under high magnification. The transparent variety tends to be macro-crystalline and the cryptocrystalline varieties are either translucent or mostly opaque.
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