'Rhombohedral iron ore' definitions:

Definition of 'Rhombohedral iron ore'

From: GCIDE
  • Rhombohedral \Rhom`bo*he"dral\, a. (Geom. & Crystallog.) Related to the rhombohedron; presenting the form of a rhombohedron, or a form derivable from a rhombohedron; relating to a system of forms including the rhombohedron and scalenohedron. [1913 Webster]
  • Rhombohedral iron ore (Min.) See Hematite.
  • Rhombohedral system (Crystallog.), a division of the hexagonal system embracing the rhombohedron, scalenohedron, etc. [1913 Webster]

Definition of 'rhombohedral iron ore'

From: GCIDE
  • Hematite \Hem"a*tite\, n. [L. haematites, Gr. ? bloodlike, fr. a"i^ma, a"i`matos, blood.] (Min.) An important ore of iron, the sesquioxide, so called because of the red color of the powder. It occurs in splendent rhombohedral crystals, and in massive and earthy forms; -- the last called red ocher. Called also specular iron, oligist iron, rhombohedral iron ore, and bloodstone. See Brown hematite, under Brown. [1913 Webster]