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felspar

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.01 sec.
felspar: see feldspar feldspar or felspar , an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these
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feldspar, felspar
any of a group of hard rock-forming minerals consisting of aluminium silicates of potassium, sodium, calcium, or barium: the principal constituents of igneous rocks. The group includes orthoclase, microcline, and the plagioclase minerals


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It was composed of black and vitreous lava, mixed with fragments of felspar.
20,000 Leagues Under The Sea by Verne, Jules View in context
Beudant [11] succeeded in making tubes, in most respects similar to these fulgurites, by passing very strong shocks of galvanism through finely-powdered glass: when salt was added, so as to increase its fusibility, the tubes were larger in every dimension, They failed both with powdered felspar and quartz.
The Voyage of the Beagle by Darwin, Charles View in context
Thus she contrives to intenerate the granite and felspar, takes the boar out and puts the lamb in and keeps her balance true.
Essays, First Series by Emerson, Ralph Waldo View in context
 
 
 
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