pegmatite - vertaling naar frans
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pegmatite - vertaling naar frans

VERY COARSE GRAINED PLUTONIC ROCK
Pegmatites; Pegmatitic
  • Pegmatite with blue [[corundum]] crystals
  • [[Proterozoic]] pegmatite swarm in the headwall of the [[cirque]] of a small [[mountain glacier]], northeastern [[Baffin Island]], [[Nunavut]]
  • Blue apatite crystals at the Harding pegmatite mine
  • Rose muscovite from the Harding pegmatite mine
  • Scatter plots of lithium grade and tonnage for selected world deposits, as of 2017
  • Pegmatite containing [[lepidolite]], [[tourmaline]], and [[quartz]] from the White Elephant Mine in the [[Black Hills]], [[South Dakota]]

pegmatite         
n. (Geology) pegmatite, crystalline granite

Definitie

pegmatite
['p?gm?t??t]
¦ noun Geology a coarsely crystalline granite or other igneous rock with crystals several centimetres in length.
Origin
C19: from Gk pegma, pegmat- 'thing joined together' + -ite1.

Wikipedia

Pegmatite

A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than 1 cm (0.4 in) and sometimes greater than 1 meter (3 ft). Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite. However, rarer intermediate composition and mafic pegmatites are known.

Many of the world's largest crystals are found within pegmatites. These include crystals of microcline, quartz, mica, spodumene, beryl, and tourmaline. Some individual crystals are over 10 m (33 ft) long.

Most pegmatites are thought to form from the last fluid fraction of a large crystallizing magma body. This residual fluid is highly enriched in volatiles and trace elements, and its very low viscosity allows molecules to migrate rapidly to join an existing crystal rather than coming together to form new crystals. This allows a few very large crystals to form. While most pegmatites have a simple composition of minerals common in ordinary igneous rock, a few pegmatites have a complex composition, with numerous unusual minerals of rare elements. These complex pegmatites are mined for lithium, beryllium, boron, fluorine, tin, tantalum, niobium, rare earth elements, uranium, and other valuable commodities.