Hematite is primarily composed of iron oxide, with the chemical formula Fe2O3. It can also contain varying amounts of other elements such as titanium, aluminum, and manganese. Grey hematite typically appears as a shiny, metallic grey or silver-gray mineral. It often has a metallic luster and may exhibit a reddish-brown streak when scratched on a rough surface.
Hematite forms in a variety of geological settings, including sedimentary, metamorphic, and igneous rocks. It often occurs as nodules or botryoidal (rounded, grape-like) formations within sedimentary rocks.
Hematite has been used since ancient times as a pigment (red ochre) and for its metallic luster in jewelry, beads, and ornaments. It is also a major ore of iron and is extensively mined for its iron content.
