Hematite | Encyclopedia
hematite. hematite (haematite, iron glance, kidney ore, red iron ore, specularite) Iron mineral, Fe 2 O 3; one of the main ores for iron; sp. gr. 4.9–5.3; hardness 5–6; trigonal; steel-grey to black, often iridescent, compact varieties dull to bright red; red to reddish-brown streak; metallic lustre; crystals tabular or rhombohedral with ...