mineral

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to translucent, with a vitreous-to-waxy luster; crystalline but the rounded, polished surface obscures crystal form and cleavage. The image is blurred, so identification is approximate.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely natural quartz rounded by erosion and subsequently tumbled or polished; quartz forms in igneous, metamorphic, and hydrothermal environments throughout geological time. It may also be milky quartz due to microscopic fluid inclusions.

Uses & applications

Used as a decorative stone, craft material, landscaping pebble, and collectible; quartz is also important industrially in glass, ceramics, electronics, and abrasives.

Geological facts

Quartz is one of Earth’s most abundant minerals and has a characteristic hardness sufficient to scratch ordinary glass. Milky coloration commonly results from trapped microscopic fluids or fractures.

Field identification & locations

Look for a glassy or waxy surface, lack of visible cleavage, and resistance to scratching by a steel knife; a streak test is white. Common sources include granite and metamorphic terrains worldwide.