metamorphic

Iron-rich quartzite or jasper fragment

Quartzite, predominantly SiO₂, with hematite/goethite iron oxides

AI-generated identification · may be incorrect

Likely hardness 6.5–7 Mohs; pale gray-white with rusty red-brown areas, vitreous to earthy luster, and no obvious cleavage. The granular texture and iron staining are consistent with quartz-rich rock, though the image alone cannot confirm exact identification.

Identified September 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone was metamorphosed and recrystallized, with later oxidation producing red iron-oxide coloration; age depends on its source formation. Common in metamorphic terrains, stream gravels, and iron-bearing deposits.

Uses & applications

Used as aggregate, paving stone, decorative stone, and occasionally as a lapidary material. This small irregular fragment has little jewelry value unless polished and attractively patterned.

Geological facts

A steel file should generally fail to scratch fresh quartzite, while a streak test may show little color because quartz is white. Strong red coloration commonly reflects hematite; yellow-brown tones suggest goethite or limonite.

Field identification & locations

Look for fused quartz grains, granular fracture, very high hardness, and absence of carbonate fizz in dilute acid. Common sources include mountain belts and glacial or alluvial gravels worldwide.