mineral

Tumbled quartz pebble

Quartz (SiO₂), likely massive microcrystalline quartz or quartz-rich chert

AI-generated identification · may be incorrect

Hardness 7 Mohs; rounded olive-gray/tan body, waxy to dull luster, no obvious cleavage, conchoidal fracture, and specific gravity about 2.65. The smooth surface indicates natural water-wearing or tumbling.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich fluids or as a component of sedimentary silica; the specimen was later rounded and likely mechanically polished. Its exact geological age and source cannot be determined from the image.

Uses & applications

Used decoratively in crafts, landscaping, mineral collections, and as a low-cost tumbled stone; not typically valuable as jewelry material.

Geological facts

The pale, uniform appearance and tiny fracture lines are consistent with common quartz-rich river stone or chert, though image-only identification is approximate.

Field identification & locations

Common worldwide in river gravels, beaches, veins, and weathered quartz deposits. A glassy fracture and scratch resistance against ordinary steel help distinguish quartz from softer stones; acid testing is unnecessary.