metamorphic

Iron-rich quartzite or weathered ironstone pebble

Quartzite, chiefly SiO₂, with iron-oxide minerals such as hematite/goethite

AI-generated identification · may be incorrect

Hardness about 6.5–7; brown to gray, earthy to weakly vitreous luster, granular crystalline texture, and no obvious cleavage. The specimen appears dense and angular, with rusty iron staining; exact identification is limited by the image.

Identified September 9, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when quartz-rich sandstone was metamorphosed into quartzite, with later weathering and iron-oxide enrichment. Such rocks commonly range from Precambrian to younger ages depending on the source formation.

Uses & applications

Used as aggregate, road stone, building stone, and occasionally as a decorative material; iron-rich pieces are mainly collected as field specimens.

Geological facts

Quartzite commonly fractures across quartz grains rather than around them and can scratch ordinary glass. Brown coloration usually reflects oxidation of iron-bearing minerals.

Field identification & locations

Look for a very hard, gritty, quartz-rich texture and resistance to scratching; a streak test, acid test, and fresh broken surface would help distinguish quartzite from ironstone or sandstone. Common in metamorphic mountain belts and gravel deposits.