metamorphic

Weathered quartz-bearing rock, possibly iron-stained quartzite

Quartzite (mostly SiO₂), tentatively identified

AI-generated identification · may be incorrect

Brown to tan, irregular and fine-grained with white granular patches likely quartz; dull to weakly glassy luster. Quartz hardness is about Mohs 7, with no obvious cleavage; exact texture and density are difficult to determine from the image.

Identified August 25, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when quartz-rich sandstone was metamorphosed and recrystallized, with brown coloration caused by iron-oxide weathering. Its geological age cannot be determined visually; quartzite occurs in rocks ranging from Precambrian to modern metamorphic belts.

Uses & applications

Common quartzite is used as crushed stone, aggregate, building stone, and decorative landscaping material; this small specimen has minimal commercial or jewelry value.

Geological facts

The white areas may be quartz veins or unweathered quartz grains, while the rusty-brown color commonly reflects hematite or limonite. A steel file should not scratch fresh quartz-rich surfaces.

Field identification & locations

Common in metamorphic mountain belts and stream gravels worldwide, especially where quartz-rich sandstone is exposed. Confirm with a hardness test, streak test, and close inspection for fused quartz grains; it could also be weathered quartz-rich sedimentary rock.