![]() The cryptocrystalline varieties of quartz may be separated into two types įibrous and microgranular. Macrocrystalline quartz grains with disseminated grains of other color imparting minerals. Some of the macrocrystalline quartz varieties are: Amethyst, Ametrine, Cat's-eye Quartz, Citrine, Phantom Quartz Crystal, Rock Crystal, Rose Quartz, Rutilated Quartz and Smoky Quartz.īlue Aventurine Quartz and Green Aventurine QuartzĪre actually quartzites (a rock, not a mineral) composed essentially of interlocking Macrocrystalline quartz in which individual crystals are distinguishable with the naked eye,Īnd cryptocrystalline quartz in which the individual crystals are too small to be easily distinguishable under the Size of the individual grains or crystals Quartz varieties are commonly separated into two groups based on the Of igneous, metamorphic and sedimentary rocks. It makes up about 12% of the earth's crust, occurring in a wide variety Quartz is the most abundant single mineral on earth. There are many named varieties of jasper.
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