felspar felsosphaerite • felstone · · · Info · Definitions · Synonyms · Characters · · felspar · · Text Latin · · Script 7 · · Length 2 · · Syllables Definitions · · · (noun) any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium. Synonyms: feldspar. · · Noun Definition 1 Synonyms · · · feldspar · · Synonym 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 f latin small letter f U+0066 l latin small letter l U+006C p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073