Feldspar

//fɛldspɑɹ// noun

noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    Any of a large group of rock-forming aluminosilicate minerals containing potassium, sodium, or calcium that, together, make up about 60% of the Earth's outer crust. countable, uncountable
  2. 2
    any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium wordnet

Synonyms

All synonyms
alabasterasphaltfelsparmineral

Example

More examples

"Rocks take time to decompose, especially quartz and feldspar."

Etymology

Partial calque of German Feldspat, formed from Feld (“field”) + Spat (“spar”), the second element replaced with the English cognate spar.

Related phrases

K-feldsparalkali feldsparglassy feldsparpotash-feldsparpotassium feldspar

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.