hematite (haematite, iron glance, kidney ore, red iron ore, specularite)
; one of the main ores for iron; sp. gr. 4.9–5.3; hardness
; steel-grey to black, often iridescent, compact varieties dull to bright red; red to reddish-brown streak
; metallic lustre
; crystals tabular
with curved, striated faces, also occurs as columnar, mammillated
, and botryoidal
masses; no cleavage
; widely distributed as an accessory mineral
rocks, hydrothermal veins
, as a rock-forming mineral in sedimentary rocks
, as a primary mineral
, as concretions or a cementing agent, and as a replacement for other minerals. Bedded ores of hematite form huge deposits in the Precambrian
of N.America and elsewhere. See BANDED IRON FORMATION
hematite (hĕm´ətīt), mineral, an oxide of iron, Fe2O3, containing about 70% metal, occurring in nature in red to reddish-brown earthy masses and in steel-gray to black crystalline forms. Hematite that has a metallic luster is called specular hematite, or specular iron. The red powdered hematite is used as a pigment (ocher) and as rouge in polishing. Hematite is the most important ore of iron. Extensive and richly productive deposits occur in the Lake Superior region (Michigan, Minnesota, and Wisconsin) and the Birmingham district (Alabama). The mineral is widely distributed throughout the world and is responsible for the red coloration of many sedimentary rocks. See limonite.
a reddish-black mineral consisting of ferric oxide. It is an important ore of iron.
One of the most important iron ores, containing mainly ferric oxide, Fe2
. Containing 70% iron by weight, it occurs in several forms and from steel-grey to black in colour.