mineral

Tumbled quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Small rounded specimen with cream-white translucent areas and a dull to glassy luster, consistent with milky quartz. Hardness is Mohs 7; quartz has a hexagonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in a silica-rich hydrothermal vein or pegmatite and later naturally rounded or mechanically tumbled; quartz is common from Precambrian to recent geological settings. The image alone cannot establish exact age or confirm whether it was tumbled.

Uses & applications

Used widely in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are used as inexpensive decorative or lapidary material.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, making it common in sand and stream gravels.

Field identification & locations

Look for hardness sufficient to scratch ordinary glass, lack of cleavage, conchoidal fracture, and white translucency; avoid testing valuable specimens destructively. Common worldwide, especially in quartz veins and river gravels.