metamorphic

Likely iron-stained quartz or quartzite pebbles

Quartz (SiO₂), possibly quartzite; identification is uncertain from the blurry image

AI-generated identification · may be incorrect

Mostly tan, brown, and gray rounded pieces with a dull to slightly glassy, wet-looking surface. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and uneven fracture; the brown color may come from iron-oxide staining.

Identified October 14, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartz forms in many geological settings; quartzite develops when quartz-rich sandstone is recrystallized by heat and pressure. The image does not allow the specimen’s age or exact formation history to be determined.

Uses & applications

Quartz and quartzite are used in construction aggregate, road material, landscaping, and decorative stone; these pieces appear to be common pebbles rather than gem-quality material.

Geological facts

Quartz is one of Earth’s most abundant minerals. Iron oxides commonly stain quartz-rich rocks yellow, orange, or brown.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and a quartz-rich texture; these traits cannot be verified from the photo. Similar pebbles occur in river and beach gravels worldwide.