metamorphic

Weathered quartz-rich rock, possibly chert or quartzite

Quartz (SiO₂), likely in a quartzite/chert matrix

AI-generated identification · may be incorrect

Hardness about 7 Mohs; gray-brown to honey-yellow, dull to slightly vitreous luster, massive microcrystalline texture, and no obvious cleavage. The rounded shape and surface appear naturally weathered or water-worn.

Identified September 16, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed from silica-rich sediment or vein material, with yellow-brown coloration from iron-oxide staining; exact age and origin require a fresh surface or testing. Common in stream gravels, weathered outcrops, and quartz veins.

Uses & applications

Unusual pieces may be collected or used as decorative stone; quartz-rich material can serve as aggregate or silica feedstock, though this small specimen has no significant commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly survives weathering because of its high hardness and chemical resistance.

Field identification & locations

Look for glassy fracture, lack of cleavage, and the ability to scratch ordinary glass; a steel file should not easily scratch it. Common worldwide, especially in quartz veins and silica-rich sediments.