mineral
Tumbled quartz (likely milky quartz)
Quartz — silicon dioxide (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; translucent pale blue-white body, vitreous luster, conchoidal fracture, and no cleavage. The rounded form is human-tumbled; internal fractures and inclusions create the cloudy appearance.
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Physical properties
Hardness 7 Mohs; translucent pale blue-white body, vitreous luster, conchoidal fracture, and no cleavage. The rounded form is human-tumbled; internal fractures and inclusions create the cloudy appearance.
Formation & geological history
Quartz crystallizes from silica-rich hydrothermal fluids and igneous melts, commonly in veins and granitic rocks. Its precise geological age and locality cannot be determined from the image.
Uses & applications
Used as a lapidary and decorative stone, in crystal collecting, abrasives, glass, and electronics. This specimen has modest value, typically about $2–$10.
Geological facts
The blue appearance may result from lighting, internal fractures, or trace inclusions; it is not necessarily blue quartz. Quartz is one of Earth’s most abundant and chemically durable minerals.
Field identification & locations
Identify it by its glassy luster, lack of cleavage, conchoidal fractures, and ability to scratch ordinary glass. Common sources include Brazil, Madagascar, the United States, and many granite-bearing regions.
