mineral
Tumbled clear quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectLikely Mohs hardness 7; translucent gray-white with a vitreous luster and irregular internal fractures or inclusions. Quartz has a trigonal crystal structure and no true cleavage; this specimen’s rounded surface appears tumbled or polished.
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Physical properties
Likely Mohs hardness 7; translucent gray-white with a vitreous luster and irregular internal fractures or inclusions. Quartz has a trigonal crystal structure and no true cleavage; this specimen’s rounded surface appears tumbled or polished.
Formation & geological history
Quartz crystallizes from silica-rich magma and hydrothermal fluids, and also occurs in veins and sedimentary deposits. Its age cannot be determined from the image and may range from ancient to geologically recent.
Uses & applications
Commonly used for jewelry, ornament, and mineral collecting; quartz is also important in glassmaking and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals and can occur in many colors and crystal forms.
Field identification & locations
Check for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; common worldwide, including Brazil, Madagascar, and the United States. The image supports a tentative identification as tumbled quartz.
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