metamorphic

Iron-stained quartzite (probable jasper-bearing quartzite)

Quartzite, predominantly SiO₂, colored by iron oxides such as hematite/goethite

AI-generated identification · may be incorrect

Hardness about 7 Mohs; reddish-brown, granular to faintly sugary texture, vitreous-to-dull luster, and no obvious cleavage. The pale sparkles and rusty coating suggest quartz grains with iron-oxide staining; exact identification would require testing.

Identified September 8, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone recrystallized under heat and pressure, with later oxidation producing the red-brown coloration. Its precise geological age and locality cannot be determined from the photograph.

Uses & applications

Used as durable aggregate, road stone, landscaping rock, and occasionally as a lapidary or decorative material. Attractive pieces may be polished, though this specimen appears mainly suitable for collecting.

Geological facts

Quartzite commonly breaks across grains rather than around them and can scratch ordinary glass. A streak test, acid test, and examination of a fresh fracture would help distinguish it from jasper, iron-rich sandstone, or quartz-rich breccia.

Field identification & locations

Likely field indicators are extreme hardness, quartz-like sparkle, granular texture, and rusty red iron staining; common worldwide in metamorphic belts. Value is usually low unless locality, color, or pattern is exceptional.