It is thought to form by the replacement of calcareous rock by silica-rich There are dozens of named varieties of jasper, usually based on the colors and/or the patterns in the jasper. Jasper is a variety of chert, which is the general termĪpplied to granular cryptocrystalline quartz varieties. JASPER GEOLOGIC OCCURRENCE AND DIAGNOSTIC FEATURES Varieties of quartz, of which Jasper and flint are examples. Carnelian, Chrysoprase and bloodstoneĬhert is the general term applied to the granular cryptocrystalline Chalcedony 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 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. Cleavage: Cryptocrystalline quartz shows no cleavage, although parting may occur along laminations.Color: red, brown or yellow, colored by finely disseminated hematite or goethite.Crystal habit: massive microgranular quartz.Crystal system: Hexagonal-R 32 (trigonal-trapezohedral).Go up to the Jasper Mineral Information Index Jasper Jewelry Linked Images of Jasper Products For Sale in our Store:Ĭatseye Blue Apatite in Jasper Lapidary Rough.Jasper with Blue Apatite Lapidary Rough.Jasper with Blue Apatite Mineral Specimens.(Follow any link to enter our Online Store) Jasper items For Sale in our Virtual Gallery: Jasper Geologic Occurance and Diagnostic Features.Jasper items For Sale in our VIRTUAL GALLERY.Links To Jasper Mineral Information Topics: JASPER: Mineral Factsheet and Information See also our other Quartz Varieties MINERALMINERS.COM ® - Your Personal 'Link' Direct to the Jasper Mines! TM Enter our Virtual Gallery of Jasper Mineral Specimens
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