mineral

Hematite Nodular Concretion

Iron Oxide (Fe2O3)

Mohs hardness 5.5-6.5, dark metallic grey to reddish-brown color, dull to sub-metallic luster, no cleavage, specific gravity around 5.26, leaves a characteristic reddish-brown streak.

Identified July 27, 2026More mineral →

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Physical properties

Mohs hardness 5.5-6.5, dark metallic grey to reddish-brown color, dull to sub-metallic luster, no cleavage, specific gravity around 5.26, leaves a characteristic reddish-brown streak.

Formation & geological history

Forms primarily through precipitation from iron-rich aqueous fluids in sedimentary environments, often creating nodular, botryoidal, or concretionary structures over millions of years.

Uses & applications

Major iron ore for industrial steel production, also used as a heavy media for sink-float separation, radiation shielding, pigment production, and polished specimens for lapidary and jewelry.

Geological facts

Hematite derives its name from the Greek word 'haima' meaning blood, due to the red color seen in its powder and streak. It has also been detected in abundance on Mars.

Field identification & locations

Identified in the field by its high density (heavy weight relative to size) and signature reddish-brown streak test. Commonly found in sedimentary iron formations and weathered zones worldwide.