metamorphic

Tumbled hematite-bearing quartzite

Quartzite, predominantly SiO₂, with hematite (Fe₂O₃) and possibly mica

AI-generated identification · may be incorrect

Hardness about 6.5–7 (quartz), gray to silvery-black with rusty red-brown streaks; granular, nonmetallic to subtly micaceous luster, massive structure, and no obvious cleavage. The metallic-looking areas may be hematite or iron-rich mica.

Identified September 13, 2026More metamorphic →

Explore Tumbled hematite-bearing quartzite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed when quartz-rich sandstone was metamorphosed under heat and pressure, with later iron-oxide staining or mineralization. Such rocks commonly range from Precambrian to younger metamorphic ages.

Uses & applications

Used as aggregate, dimension stone, and decorative material; small polished pieces are sold as lapidary specimens or worry stones, usually with modest value.

Geological facts

Quartzite is tougher and more resistant to weathering than its sandstone precursor. Hematite commonly produces the characteristic red-brown streak and rusty veining.

Field identification & locations

Identify by its very hard, gritty quartz-rich body, lack of obvious bedding, and inability to scratch with a steel knife; hematite-rich zones may leave a reddish-brown streak on unglazed porcelain. Common in metamorphic belts worldwide, including India, Brazil, the United States, and Scandinavia.