mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to pale cream, with a vitreous-to-waxy luster and no cleavage. It has a trigonal crystal structure, though tumbling has rounded its surfaces; the appearance may also fit pale chalcedony or calcite, but quartz is most likely.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and hydrothermal environments through silica-rich crystallization; specimens may be Precambrian to recent. This piece appears mechanically tumbled and polished from a natural fragment.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and decorative objects; attractive pieces are sold as inexpensive healing stones or display specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Milky color results mainly from microscopic fluid or gas inclusions.

Field identification & locations

Typical localities include Brazil, Madagascar, the United States, and worldwide quartz-bearing rocks. A steel file should not easily scratch it; vinegar effervescence would suggest calcite instead.