The composition of quartz is the simplest silica, with glass luster, no cleavage surface, but with a shell-like fracture. Microcrystalline quartz is called chalcedony, agate, or jasper. Pure quartz is colorless, but it shows a different color because it often contains impurities of transition elements. Quartz is very stable, not easy to weather or change into other kinds of minerals. According to the degree of crystallization of SiO2, it can be divided into crystalline single crystal quartz and polycrystalline quartzite jade. Luster: Glass luster. Color: none, white, with a little gray, yellow to orange, purple, deep purple, pink, grayish brown, brown, black. Streaks: white. Specific gravity: 2.65 ~ 2.66. Category: Metamorphic rock, metamorphosed from sandstone.
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