Plagioclase rhymes with:
orthoclase, orthoclase, anyplace, birthplace, cityplace, commonplace, everyplace, fireplace, lovelace, marketplace, orthoclase, parcplace, shoelace, showplace, someplace, workplace
orthoclase, orthoclase, anyplace, birthplace, cityplace, commonplace, everyplace, fireplace, lovelace, marketplace, orthoclase, parcplace, shoelace, showplace, someplace, workplace