Hematite

Hematite (Fe₂O₃) — a common iron oxide mineral, captivates with its characteristic metallic to submetallic luster and colors ranging from steel-gray and iron-black to reddish-brown. Its name originates from the Greek word "haima" (blood), referring to the bright red streak of the mineral, which becomes evident when ground into powder or scratched against unglazed porcelain.

This mineral can manifest in various forms, making it a fascinating collector's item: from dense massive aggregates and striking reniform or botryoidal formations (known as "kidney ore") to lustrous crystalline plates (specularite or "iron glance") and earthy, powdery masses (red ocher). Hematite forms under diverse geological conditions: in sedimentary rocks (as a primary component of iron ores), hydrothermal veins, and as a result of metamorphism. It is one of the most important industrial sources of iron.

 Historically, hematite was used as a pigment due to its rich red powder. Today, beyond its industrial significance as an iron ore, it is valued in jewelry (especially its mirror-like varieties) and as a popular collector's mineral thanks to its diverse forms, distinctive luster, and rich history.