mineral

Nobby Hematite (Iron Ore)

Hematite (Fe2O3)

Hardness: 5.5-6.5 on Mohs scale. Color: Dark brown to metallic black, but produces a characteristic rust-red streak. Luster: Metallic to dull/earthy. Structure: Trigonal. Specific Gravity: 5.26.

Hardness: 5
Luster: Metallic to dull/earthy

Identified March 30, 2026More mineral →

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Physical properties

Hardness: 5.5-6.5 on Mohs scale. Color: Dark brown to metallic black, but produces a characteristic rust-red streak. Luster: Metallic to dull/earthy. Structure: Trigonal. Specific Gravity: 5.26.

Formation & geological history

Formed primarily in sedimentary environments through precipitation from water, often in Banded Iron Formations (BIFs). The age of such deposits often exceeds 2 billion years (Precambrian era).

Uses & applications

Primary ore of iron used for steel production. Also used as a pigment (ochre), in radiation shielding, and occasionally as a gemstone or in jewelry.

Geological facts

Hematite's name is derived from the Greek word 'haima', meaning blood, because of its red streak. It is also found in significant quantities on Mars, giving the 'Red Planet' its color.

Field identification & locations

Identify in the field by its high density (feels heavy for its size) and by performing a streak test on unglazed porcelain to see the reddish-brown mark. Common in mining districts like the Lake Superior region or Western Australia.