corundum Definition

corundom, emery, spinel, smoky quartz, alexandrite, chalcedony, diopside, morganite, octahedron, beryl, boron nitride, pyrope, pyrochlore, feldspars, olivine, aluminosilicate, plagioclase, eclogite, carbides, crystallites, pyrites, metamorphic rock, uraninite, pearlite, goethite, aragonite, columbium, pyroxene, zirconium oxide, aluminous, claystone, phlogopite, halite, montmorillonite, lamellae, amphibole, phyllosilicate, azurite, chalcocite, scheelite, barium sulphate, nephrite, yttrium oxide, chrysocolla, garnets, labradorite, hornblende, anhydrite, mgo, calcium fluoride, concretions, kaolinite, praseodymium, cherty, calcic, calcium sulphate, leucoxene, smectite, eudialyte, feo, covellite, nepheline, electrum, colloid, pyrophyllite, nacre, kyanite, greisen, apatite, monazite, zns, allanite, haematite, cementite, trioxide, molybdenite, autunite, carnotite, cabochons, albite, aluminum oxide, amphibolite, fluorapatite, schistose, pentlandite, halides, marcasite, ellipsoids, illite, polybutadiene, malachite, anatase, epidote, stibnite, sericite, birefringence, siderite, gangue, lepidolite, phyllite,