Hematite

Hematite is a mineral composed of iron oxide (Fe₂O₃), one of the world's main iron ores. It occurs in various forms, with colors ranging from metallic steel-grey to black, but also from red-brown to bright red in powdered form. It can form tabular crystals, botryoidal aggregates, or compact masses with metallic reflections.

Found in many geological environments, hematite is often associated with quartz, goethite, or limonite and is an emblematic mineral appreciated for its varied forms and particular luster.