mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to gray, translucent to opaque, with a vitreous-to-waxy luster and irregular fracture; Mohs hardness 7, no cleavage, and specific gravity about 2.65. The specimen appears rounded and weathered, possibly with minor feldspar or mica inclusions.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids, and also accumulates as resistant stream or glacial gravel. Its exact age cannot be determined from the image; it may derive from an older granite, pegmatite, or metamorphic vein.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive pieces are sold as inexpensive lapidary or display specimens.

Geological facts

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

Field identification & locations

Identify it by its hardness—scratching ordinary glass—lack of cleavage, and pale translucent appearance; a steel nail should not scratch it easily. Common worldwide, especially in quartz veins, granitic terrains, river gravels, and beaches.