octahedrite (oktahedrit)

[As octahedron + -ite2.] Titanium dioxid, crystallizing crystallizing in the tetragonal system, the fundamental and commonly occurring form being an acute square octahedron (whence the name); anatase. It is also found in a variety of other related forms. The luster is adamantine or metallic-adamantine, and the color varies from yellow to brown, indigo-blue, and black. Titanium dioxid also occurs in nature as the minerals rutile and brookite (which see). Also octaëdrite, octoëdrite. octahedron (ok-ta-hedron), n. [Also octaë dron, octohedron; = F. octaèdre = Sp. Pg. octa edro It.ottaedro, summits. In crystallography, the regular octahe Regular Octahedron. dron is distinguished from the analogous eight-sided solids in the tetragonal and orthorhombic systems, which are called respectively square and rhombic octahedrons. Truncated octahedron, a te arescædecahedron formed by cutting off the corners of the regular octahedron paral to the faces of the coaxial cube far enough to leave them regular hexagons, while adding six square faces. It is one of the thirteen Arch i me dean solids. octamerous (ok-tam'e-rus), a. [ octarchy