mineral

Rounded white pebble, likely milky quartz

Quartz (silicon dioxide, SiO₂), tentative visual identification

AI-generated identification · may be incorrect

Opaque to translucent cream-white, with a smooth rounded surface and faint tan veining; likely vitreous when freshly broken, Mohs hardness 7, no cleavage, uneven fracture, and specific gravity about 2.65. The image does not show enough detail to confirm the mineral definitively.

Identified September 23, 2026More mineral →

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Physical properties

Formation & geological history

If quartz, it formed as silica crystallized in igneous or hydrothermal settings, or as grains in sedimentary rocks; this pebble was likely rounded by water or abrasion. Its geological age and original source cannot be determined from the photo.

Uses & applications

Common quartz is used in glassmaking, electronics, abrasives, and ornamental objects; attractive pebbles are used in crafts and landscaping.

Geological facts

Quartz is among Earth’s most abundant minerals and resists weathering, allowing it to persist as rounded river and beach pebbles.

Field identification & locations

A hardness test (quartz scratches glass) and examination of a fresh surface can help distinguish it from softer calcite or similar pale stones. Pale rounded quartz pebbles occur widely in river, beach, and glacial deposits.