mineral

Tumbled milky quartz pebble

Quartz (SiO₂), likely cryptocrystalline or massive quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; creamy white to honey-colored, translucent, with a vitreous-to-waxy luster and no visible cleavage. The rounded shape indicates natural abrasion or tumbling; specific gravity is about 2.65.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in veins or cavities, likely during hydrothermal activity; its exact geological age cannot be determined from the image. It was later rounded by erosion or mechanical tumbling.

Uses & applications

Commonly used as a low-cost decorative stone, craft material, worry stone, and lapidary cabochon; generally modest collector value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering. The milky appearance results mainly from microscopic fluid inclusions, fractures, or dispersed impurities.

Field identification & locations

Identify it by its glassy/waxy appearance, rounded form, lack of cleavage, and ability to scratch ordinary glass. Common in river gravels, quartz veins, pegmatites, and commercial tumbled-stone assortments.