mineral
Tumbled quartz (likely milky/rose quartz)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; translucent grayish-white to pale pink, with a vitreous-to-waxy luster and no cleavage. Quartz is trigonal and has a specific gravity near 2.65; tumbling has rounded and polished the surface.
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Physical properties
Hardness 7 Mohs; translucent grayish-white to pale pink, with a vitreous-to-waxy luster and no cleavage. Quartz is trigonal and has a specific gravity near 2.65; tumbling has rounded and polished the surface.
Formation & geological history
Quartz crystallizes from silica-rich igneous and hydrothermal fluids and also occurs in metamorphic rocks and sedimentary veins. The specimen is human-processed; its exact geological age and source cannot be determined visually.
Uses & applications
Commonly sold as a decorative tumbled stone, meditation stone, or lapidary material; larger clear pieces may be used in jewelry. Ordinary tumbled quartz has modest commercial value.
Geological facts
The apparent pink-gray color may result from iron, inclusions, or surface lighting rather than true rose quartz. Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many veins.
Field identification & locations
Identify it by its glassy luster, strong scratch resistance, rounded polish, and lack of cleavage; it should scratch ordinary glass but not be scratched by a steel knife. Common worldwide, especially in Brazil, Madagascar, the United States, and Europe.
