Definition & Betydelse | Engelska ordet PEGMATITE

Definition av PEGMATITE

1. pegmatit

Exempel på hur man kan använda PEGMATITE i en mening

• Amblygonite occurs with spodumene, apatite, lepidolite, tourmaline, and other lithium-bearing minerals in pegmatite veins.
• Orthoclase is a common constituent of most granites and other felsic igneous rocks and often forms huge crystals and masses in pegmatite.
• Natural resources in the Flowery Branch area include: gray marble, marble, clay, granite, graphite, limestone, iron ore, manganese, pegmatite, mica, beryl, quartzite, zircon, lead, copper, silver, and gold as known by the local Gold Hill Mine and regional popularity of The Hall County Gold Belt prospected during the Georgia Gold Rush.
• These pegmatite mines and quarries yield more than 100 different minerals, including minerals containing rare-earth elements, beryllium, scandium, uranium, and thorium.
• The lighter-colored pegmatite dikes that can be seen crosscutting the basement rocks formed later during this same period.
• Phenakite is found in high-temperature pegmatite veins and in mica-schists associated with quartz, chrysoberyl, apatite and topaz.
• The texture can be similar to micrographic texture and to the coarser graphic intergrowths of quartz and alkali feldspar common in pegmatite.
• Greisen is a highly altered granitic rock or pegmatite, usually composed predominantly of quartz and micas (mostly muscovite).
• These consist of gneiss, and gneissic diorite and quartz diorite, intruded by irregular bodies of equigranular granitic rocks, predominantly quartz diorite and granodiorite, with accompanying pegmatite and aplite.
• The glaze, applied as enamel over the kaolin paste after firing is made mainly of Marcognac pegmatite, mixed with feldspath and quart.
• They are charnockite, hornblende gneiss, migmatitic amphibolite, quartz biotite gneiss, quartz-feldspathic gneiss, biotite granite gneiss, and pegmatite.
• It occurs as creamy to white anhedral to subhedral grains in pegmatite and aplite pods or lenses in a peralkaline igneous intrusion.
• Remains of this activity is the whole array of igneous rocks found in central Serbia: andesite, dacite, trachyte, rhyolite, peridotite, granite, gabbro, pegmatite, basalt, diabase, etc.
• It is a pegmatite geologic province which can be divided into the following megastructures: Middle Prydniprovia, Western Pryazovia, Eastern Pryazovia, Ingulski, Rosynsko-Tikychki, Dnistersko-Buzki and Volyn, which differ in mineralogical composition and geochemical specialization.
• It consists of a pegmatite, lies near the eastern edge of the Central Mineral Region in the Texas Hill Country and is named for John Baringer, who discovered here much gadolinite about 1887.
• Other deposits include migmatite rocks, to a lesser extent also amphibolite, serpentinite, granulite, and pegmatite.
• It also occurs in blocks of pegmatite as rock-forming grains in a moraine of the Dara Pioz glacier in northern Tajikistan; in the Del Salto pluton in Aysén Province, Chile; as euhedral crystals at Virikkollen, Haneholmveien, Sandefjord, Norway; Ampasibitika, Ampasindava Peninsula, Madagascar; and as gemmy crystals up to 3 cm from Mt.
• It forms from the oxidation of ferberite within granitic pegmatite dykes and in pegmatitic greisen veins.
• In Nigeria, pegmatite deposits of coltan are frequently also the source of several precious and semi-precious stones such as beryl, aquamarine, and tourmaline.
• Work at Lilypad in 2001-2002 focused on defining tantalum resources, but was also successful in identifying widespread occurrences of the cesium ore mineral pollucite in a field of highly fractionated lithium-cesium-tantalum pegmatite dykes.

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