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JASPEROID

Jasperoid

Type of rock

Jasperoid is a rare, peculiar type of metasomatic alteration and occurs in two main forms; sulfidic jasperoids and hematitic jasperoids. True jasperoids

Jasperoid

List of rock types

Jadeitite – Metamorphic rock found in blueschist-grade metamorphic terranes Jasperoid – Type of rock – A hematite-silica metasomatite analogous to a skarn Kenyte –

List of rock types

List_of_rock_types

Breccia

Rock composed of angular fragments

gray is mostly dolomite with a little translucent quartz. Dark gray is jasperoid and ore minerals. Veinlet along lower edge of specimen contains sphalerite

Breccia

Lander County, Nevada

County in Nevada, United States

Theodore, T.G. and G.M. Jones. (1992). Geochemistry and geology of gold in jasperoid, Elephant Head area, Lander County, Nevada [U.S. Geological Survey Bulletin

Lander County, Nevada

Lander_County,_Nevada

Teschenite

Type of igneous rock

Epidosite Felsite Flint Ganister Gossan Hyaloclastite Ijolite Jadeitite Jasperoid Kenyte Lapis lazuli Larvikite Litchfieldite Llanite Luxullianite Mangerite

Teschenite

Carlin–type gold deposit

Sediment-hosted disseminated gold deposit

silicate rich hydrothermal water. For example, dolomite is transformed into jasperoid. Another alteration is the formation of clay minerals by interaction of

Carlin–type gold deposit

Carlin–type_gold_deposit

Metasomatism

Chemical alteration of a rock by hydrothermal and other fluids

calc-silicates, and silica-hematite fluids resulting in production of jasperoids, manto ore deposits and pervasive zones of silicification, typically in

Metasomatism

London Bridge Branch

Protected natural area in Virginia, United States

medium-bedded gray limestone, and yellowish brown residual clays with "jasperoid" diagnostic. The Forest Service has conducted a survey of their lands

London Bridge Branch

London_Bridge_Branch

Geology of Kyrgyzstan

These are examples of quartz-fluorite-antimonite-cinnabar (also known as jasperoid type deposits), while others are quartz-dickite-cinnabar or magnesian-carbonate-cinnabar

Geology of Kyrgyzstan

Geology_of_Kyrgyzstan

Leadville mining district

Mining district

Manitou Dolomite. Ore minerals are pyrite, sphalerite, and galena, in jasperoid and manganosiderite gangue. In upper levels, the ore minerals are oxidized

Leadville mining district

Leadville_mining_district

Silver mining in the United States

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,

Silver mining in the United States

Silver_mining_in_the_United_States

Beaverdam Creek (conservation area)

Protected natural area in Virginia, United States

medium-bedded gray limestone, and yellowish brown residual clays with "jasperoid" diagnostic. The area, divided by Holston Mountain, has a northern part

Beaverdam Creek (conservation area)

Beaverdam_Creek_(conservation_area)

Geology of Nevada

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

Geology of Nevada

Geology_of_Nevada

Okladnikov Cave

Cave and archaeological site in Russia

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

Okladnikov Cave