corundum, smoky quartz, dodecahedron, feldspars, cabochon, alexandrite, pyrope, chalcedony, sepal, punctate, lamellae, aventurine, phlogopite, icosahedral, boron nitride, beryl, azurite, plagioclase, crystallites, polyhedron, morganite, ellipsoids, labradorite, laths, carnelian, phyllite, midrib, eclogite, aluminosilicate, chrysocolla, uraninite, zirconium oxide, peridot, argentiferous, greisen, spinel, nephrite, pontil, hornblende, muscovite, marcasite, lapilli, chromophore, electrum, covellite, carbides, birefringence, cadmium sulfide, quasicrystal, drupe, pyrochlore, allanite, siderite, micrograph, micrometre, carnotite, condyle, nacre, eosin, chalcocite, striations, mylonite, papule, dentine, diffraction grating, conic, martensite, cementite, verdigris, blebs, agarose, fibril, goethite, cherty, autunite, calyx, albite, scheelite, amphibolite, tetrahedron, pentlandite, calculi, tetrahedrite, laminae, openwork, synclinal, trabeculae, tesserae, jadeite, realgar, rhomboid, claystone, citrine, lunate, umbels, threadlike, mgo, diopside, spicule, yttrium oxide, concretion, epidote, hexagon, octahedra, tetrahedra, polygon, prism, triangle, lattice, parallelogram, pyramid, triangles, cube, octahedrons, parallelepiped, rectangle, trapezoid, ellipsoid, prisms, quadrilateral, dodecahedral, octahedral, rhombohedral, cleaved, hexagonal, polyhedral, rhombic, angled, beveled, chiseled, equilateral, facetted, hemihedral, polygonal, prismatic, refracting, rhomboidal, trigonal, undistorted, abraded

regular octahedron