mineral

Milky quartz pebble with dark mineral band

Quartz, SiO₂; likely a vein-quartz pebble with a thin band of dark inclusions

AI-generated identification · may be incorrect

Mostly opaque white to cream with a vitreous-to-dull surface and gray-black speckling or banding. Quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65; the pebble’s rounded shape suggests natural water wear.

Identified September 30, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids filled a fracture and crystallized, with the dark band recording mineral inclusions or a boundary in the vein. Quartz veins occur in rocks of many ages; the image cannot establish its precise age or source.

Uses & applications

Common quartz is used in glassmaking, electronics, abrasives, and decorative stone; this small pebble is mainly suitable for collecting or crafts.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly survives erosion to accumulate in stream and beach gravels.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and a glassy appearance on fresh breaks; rounded edges indicate transport. Quartz pebbles occur worldwide in river and coastal deposits.