mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂), microcrystalline or massive variety

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, rounded from tumbling, and lacking visible cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The cloudy appearance is caused by microscopic fluid inclusions or fractures.

Identified September 19, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids and igneous melts in many geological settings; this specimen is likely a modern polished/tumbled piece rather than a naturally rounded pebble. Quartz ranges from Precambrian to recent formations.

Uses & applications

Used for lapidary items, inexpensive jewelry, ornaments, and crystal collections; quartz is also important industrially in glass, ceramics, electronics, and abrasives.

Geological facts

It can scratch ordinary glass and steel, but should not be confused with white calcite, which is much softer and reacts with acid.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and Europe. Confirm with a glass-scratch test and, if necessary, hardness or specific-gravity testing; the image alone cannot distinguish quartz from glass with certainty.