metamorphic

Iron-stained quartzite

Quartzite, composed predominantly of quartz (SiO₂), with iron-oxide staining

AI-generated identification · may be incorrect

A rough, tan-orange, granular-looking rock with a dull to slightly sparkly surface; quartz has Mohs hardness 7 and a trigonal crystal structure, though individual grains may be hard to distinguish. The orange-brown color likely comes from iron oxides; identification from the image alone is uncertain.

Identified September 30, 2026More metamorphic →

Explore Iron-stained 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

Forms when quartz-rich sandstone is fused and recrystallized by heat and pressure, commonly during regional metamorphism; its age depends on the source rock and metamorphic event.

Uses & applications

Quartzite is used as crushed stone, building and decorative stone, and sometimes as a silica source; this unpolished piece is mainly suitable for collecting.

Geological facts

Quartzite is typically much harder and more resistant to weathering than its sandstone precursor.

Field identification & locations

Look for interlocking quartz grains and a surface that scratches glass; unlike sandstone, quartzite often breaks through grains rather than around them. It occurs worldwide in metamorphic terrains; the pictured specimen’s exact locality cannot be determined.