The Collaborative International Dictionary
Octahedrite
Octahedrite \Oc`ta*he"drite\, n. (Min.) Titanium dioxide occurring in acute octahedral crystals.
Wiktionary
octahedrite
n. (context mineralogy English) The mineral anatase.
Wikipedia
Octahedrite
Octahedrites are the most common structural class of iron meteorites. The structures occur because the meteoric iron has a certain nickel concentration that leads to the exsolution of kamacite out of taenite while cooling.