mineral
Tumbled Hematite with Quartz/Chert (Specular Hematite)
Fe2O3 (Iron Oxide)
Mohs hardness of 5.5-6.5; metallic to sub-metallic shimmer with dark gray to silver-black hue and slight greenish chatoyancy or reflection under direct light; smooth tumbled surface with a dense, heavy feel. Streak is characteristically reddish-brown.
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Physical properties
Mohs hardness of 5.5-6.5; metallic to sub-metallic shimmer with dark gray to silver-black hue and slight greenish chatoyancy or reflection under direct light; smooth tumbled surface with a dense, heavy feel. Streak is characteristically reddish-brown.
Formation & geological history
Formed primary through precipitation from iron-rich water in marine environments (Banded Iron Formations) or hydrothermal veins. Common in Precambrian deposits dating back over 1.8 to 2.4 billion years.
Uses & applications
Widely used as an iron ore in steel manufacturing, processed into pigments, carved into beads, cabochons, or polished tumbled stones for metaphysical, crystal healing, and jewelry uses.
Geological facts
Hematite is famous for its bright reddish-brown streak, which differentiates it from other heavy dark minerals like magnetite. NASA's Opportunity rover discovered significant deposits of hematite ('blueberries') on Mars, suggesting past liquid water.
Field identification & locations
Identified by its high specific gravity (feels heavy for its size), metallic sheen, and characteristic reddish streak when scraped across unglazed porcelain. Commonly found in Brazil, Australia, South Africa, Lake Superior region (USA), and China.
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