octahedrite

Century Dictionary and Cyclopedia

1. n. Titanium dioxid, 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 octaėdrite, octoėdrite.
2. n. A meteoric iron with octahedral structure, which is usually distinctly marked by the lamellæ of kamacite, tænite, and plessite, seen in the Widmannstättian figures. Most iron meteorites fall in this class. See meteorite.

GNU Webster's 1913

1. n. Titanium dioxide occurring in acute octahedral crystals.