Jasperoid is a rare, peculiar type of metasomatic alteration and occurs in two main forms; sulfidic jasperoids and hematitic jasperoids. True jasperoids are different from jaspillite, which is a form of metamorphosed chemical sedimentary rock, and from jasper which is a chemical sediment.
Sulfidic jasperoids are typical examples of silica-sulfide metasomatism of dolomites, and are found in Nevada, Australia and Iran. They are hard, dense purple-black rocks with considerable content of pyrite. The bodies in Nevada are quite thin (seldom greater than 8 m) and stratabound.
Jasperoid is a rare, peculiar type of metasomatic alteration and occurs in two main forms; sulfidic jasperoids and hematitic jasperoids. True jasperoids...
gray is mostly dolomite with a little translucent quartz. Dark gray is jasperoid and ore minerals. Veinlet along lower edge of specimen contains sphalerite...
Jadeitite – Metamorphic rock found in blueschist-grade metamorphic terranes Jasperoid – A hematite-silica metasomatite analogous to a skarn Kenyte – Type of...
calc-silicates, and silica-hematite fluids resulting in production of jasperoids, manto ore deposits and pervasive zones of silicification, typically in...
Manitou Dolomite. Ore minerals are pyrite, sphalerite, and galena, in jasperoid and manganosiderite gangue. In upper levels, the ore minerals are oxidized...
and Geology, Bulletin 87, p.141. E. J. Young and T. G. Lovering (1966) Jasperoids of the Lake Valley mining district, New Mexico, US Geological Survey,...
medium-bedded gray limestone, and yellowish brown residual clays with "jasperoid" diagnostic. The Forest Service has conducted a survey of their lands...
These are examples of quartz-fluorite-antimonite-cinnabar (also known as jasperoid type deposits), while others are quartz-dickite-cinnabar or magnesian-carbonate-cinnabar...
microscopic gold associated with pyrite and arsenic sulfides and particularly jasperoid in folds and faults. Over 200 million ounces of gold are known to be distributed...
scraper-knives. Around a quarter of the tools at Okladnikov Cave were made from jasperoids, while around 5% were made from hornstones. The lithic industry at Okladnikov...
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