hematite

n. iron ore

Hematite, also spelled hæmatite, is the mineral form of Iron(III) oxide, (Fe2O3), one of several iron oxides. Hematite crystallizes in the rhombohedral system, and it has the same crystal structure as ilmenite and as corundum. Hematite and ilmenite form a complete solid solution at temperatures above 950°C.
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Noun
1. the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form
(synonym) haematite
(hypernym) iron ore
(substance-holonym) emery

n. hematite

n. (Port.=hematite) iron ore, hematite