feldspar - definizione. Che cos'è feldspar
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Cosa (chi) è feldspar - definizione

MINERAL GROUP
Feldspars; Felspar; Feldspath; Feldspathic; Veldspar; Felspathic; Feltsparr; Alkali feldspar; Alkali Feldspar
  • Compositional phase diagram of the different minerals that constitute the feldspar solid solution.

Feldspar         
·noun ·Alt. of Feldspath.
feldspar         
['f?ldsp?:]
(also felspar)
¦ noun an abundant rock-forming aluminosilicate mineral, typically colourless or pale-coloured.
Derivatives
feldspathic adjective
Origin
C18: alt. of Ger. Feldspat, Feldspath, from Feld 'field' + Spat, Spath 'spar' (see spar3); the form felspar is by mistaken assoc. with Ger. Fels 'rock'.
alkali feldspar         
¦ noun Geology any of the group of feldspars rich in sodium and/or potassium.

Wikipedia

Feldspar

Feldspars (sometimes spelled felspars) are a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium-sodium) feldspars. Feldspars make up about 60% of the Earth's crust, and 41% of the Earth's continental crust by weight.

Feldspars crystallize from magma as both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcic plagioclase feldspar is known as anorthosite. Feldspars are also found in many types of sedimentary rocks.

Esempi dal corpus di testo per feldspar
1. It was analysed as feldspar, a common mineral found on Earth and Mars, says Wyatt from the Arizona State University, which has the world‘s only Mars imaging programme to teach the young to think like scientists.