mineral

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster with no visible crystal faces; Mohs hardness 7, conchoidal fracture, no cleavage, and specific gravity about 2.65. The smooth elongated shape indicates polishing or natural abrasion.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich hydrothermal fluids or igneous and metamorphic processes; its geological age depends on the source rock, commonly Paleozoic to Precambrian. The specimen was likely shaped by tumbling.

Uses & applications

Used as an inexpensive ornamental stone, lapidary material, décor, and occasionally in jewelry; quartz is also important industrially in glass, ceramics, electronics, and abrasives.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or dispersed impurities that scatter light. It may be confused with white chalcedony, calcite, or man-made glass.

Field identification & locations

Common in quartz veins, granites, pegmatites, metamorphic rocks, and alluvial gravels worldwide. Scratch testing with steel or glass can help: quartz scratches glass, while calcite does not; avoid testing polished surfaces.