mineral

Hematite Pebble

Hematite (Alpha Fe2O3)

Hardness: 5.5-6.5; Color: Reddish-brown to black; Luster: Metallic to earthy; Structure: Hexagonal; Specific Gravity: 5.26; Red streak

Hardness: 5
Color: Reddish-brown to black
Luster: Metallic to earthy

Identified June 13, 2026More mineral →

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Physical properties

Hardness: 5.5-6.5; Color: Reddish-brown to black; Luster: Metallic to earthy; Structure: Hexagonal; Specific Gravity: 5.26; Red streak

Formation & geological history

Formed through hydrothermal processes or sedimentary precipitation in iron-rich waters, often shaped into smooth pebbles by water erosion in rivers or coastal areas.

Uses & applications

Main ore of iron; used as a weight, for polishing (jeweler's rouge), and frequently as a pocket stone or in bead jewelry.

Geological facts

The name comes from the Greek word for blood, 'haima', because of its red color when powdered. It is common on Mars, giving the 'Red Planet' its hue.

Field identification & locations

Identify by its heavy weight relative to size and the characteristic rust-red streak it leaves on unglazed porcelain. Commonly found in iron mines and beach gravels.