![]() Jasper's typical reddish brown color is due to Jasper occurs as a petrifying agent in fossil wood and bone. Jasper is commonly associated with interbedded hematite ore deposits Solutions, and also by direct marine precipitation of silica gel or organic Some jaspers are believed to form by the replacement of calcareous rock by silica-rich ![]() Jasper is a variety of chert, which is the general termĪpplied to granular cryptocrystalline quartz varieties. JASPER OCCURRENCE AND DIAGNOSTIC FEATURES Varieties of quartz, of which flint and Jasper are examples. Carnelian, Chrysoprase and bloodstoneĬhert is the general term applied to the granular cryptocrystalline Chalcedon圜halcedony is the general termĪpplied to the fibrous cryptocrystalline varieties.Īgate is an example of a fibrous cryptocystallineīanded chalcedony variety of quartz. 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, 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.
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