mineral
Tumbled milky quartz
Quartz (SiO₂), likely iron-stained massive quartz
AI-generated identification · may be incorrectMohs hardness 7; opaque to translucent white and honey-brown, vitreous luster when polished, trigonal crystal structure. Massive quartz has no visible cleavage and breaks with a conchoidal fracture; specific gravity about 2.65.
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Physical properties
Mohs hardness 7; opaque to translucent white and honey-brown, vitreous luster when polished, trigonal crystal structure. Massive quartz has no visible cleavage and breaks with a conchoidal fracture; specific gravity about 2.65.
Formation & geological history
Quartz crystallizes from silica-rich fluids or magma and is also common in veins and pegmatites; iron oxides likely produced the brown staining. The specimen’s age and source cannot be determined from the image.
Uses & applications
Commonly tumbled for décor, collecting, and inexpensive jewelry; quartz is also used in glassmaking, electronics, and abrasives.
Geological facts
Quartz is one of Earth’s most abundant minerals and occurs in many colors due to trace impurities and inclusions.
Field identification & locations
Look for hardness near 7, glassy luster, and irregular fracture; brown coloration may be iron staining. Quartz is widespread worldwide, and this appears to be a polished/tumbled specimen.
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Mineral