mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, massive rather than visibly crystalline, with conchoidal fracture and no cleavage; Mohs hardness 7, specific gravity about 2.65. The dark spot may be an iron-oxide or other mineral inclusion, though the image is insufficient for certainty.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally weathered quartz fragment derived from quartz-rich igneous or metamorphic rock, then rounded by stream or beach transport. Quartz formed throughout geologic time, commonly during igneous crystallization, hydrothermal activity, or metamorphism.

Uses & applications

Used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive curios or lapidary material. This small specimen has minimal commercial value unless the inclusion proves unusual.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or defects that scatter light. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify with a glass-scratching test (quartz should scratch ordinary glass), lack of cleavage, and conchoidal fracture; avoid destructive testing if valued. Common in stream gravels, veins, granites, pegmatites, and metamorphic terrains.