feldspar C2 Topic:Materials & Substances Also spelled felspar US /ˈfɛldˌspɑr/ UK /ˈfɛldspɑː/ See IPA manual Freq #70665 Meanings 1 noun any mineral in a major group of rock-forming aluminosilicates containing potassium, sodium, or calcium Pink feldspar crystals stood out clearly in the coarse-grained granite. 2 noun the feldspar mineral group considered collectively, which makes up much of Earth's crust Feldspar weathers into clay minerals at the exposed surface. Thesaurus Synonyms 1 noun · any mineral in a major... felspar 2 noun · the feldspar mineral group... feldspar group Word family Derived forms feldspathicfeldspathoid Related forms granitealuminosilicateorthoclaseplagioclase Etymology A partial calque of German Feldspat, from Feld, 'field,' + Spat, 'spar,' with the second element replaced by its English cognate. Felspar is an established spelling variant. Topics Materials & Substances External links Cambridge Dictionary Wiktionary Google Images # feldspar **Type:** Word **Level:** C2 **Part of speech:** noun **IPA (US):** /ˈfɛldˌspɑr/ **IPA (UK):** /ˈfɛldspɑː/ **Frequency rank:** 70665 ## Meanings 1. any mineral in a major group of rock-forming aluminosilicates containing potassium, sodium, or calcium 2. the feldspar mineral group considered collectively, which makes up much of Earth's crust ## Examples - Pink feldspar crystals stood out clearly in the coarse-grained granite. - Feldspar weathers into clay minerals at the exposed surface. ## Synonyms - felspar ## Derived Forms - feldspathic - feldspathoid ## Related Forms - granite - aluminosilicate - orthoclase - plagioclase ## Etymology A partial calque of German Feldspat, from Feld, 'field,' + Spat, 'spar,' with the second element replaced by its English cognate. Felspar is an established spelling variant. ## Topics - Materials & Substances markdown