FEL'SPATH, n. A mineral widely distributed and usually of a foliated structure. When in crystals or crystalline masses, it is very susceptible of mechanical division at natural joints. its hardness is a little inferior to that of quartz. There are several varieties, as common feldspar,the adularia, the siliceous, the glassy, the ice-spar, the opalescent, aventurine feldspar, petuntze, the granular, and the compact. |
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