mineral
Tumbled quartz (likely milky or included quartz)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectTypically Mohs hardness 7, vitreous to waxy luster, white-gray translucent appearance, and conchoidal fracture; the rounded shape is human-tumbled. The visible brown-gray inclusions may be iron oxides, clay, or other minerals, so exact identification from the image is uncertain.
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Physical properties
Typically Mohs hardness 7, vitreous to waxy luster, white-gray translucent appearance, and conchoidal fracture; the rounded shape is human-tumbled. The visible brown-gray inclusions may be iron oxides, clay, or other minerals, so exact identification from the image is uncertain.
Formation & geological history
Quartz forms in igneous, metamorphic, and sedimentary environments, commonly crystallizing from silica-rich hydrothermal fluids or cooling magma. Its age depends on the source rock and may range from recent to billions of years.
Uses & applications
Used for glass, ceramics, electronics, abrasives, and ornamental stones; attractive tumbled pieces are sold for collecting and jewelry. “Earth healer” and stress-relief claims are spiritual traditions, not scientifically established properties.
Geological facts
Quartz is one of Earth’s most abundant minerals and has a distinctive six-sided crystal structure when unmodified. It commonly survives weathering because of its high hardness and chemical resistance.
Field identification & locations
Look for hardness sufficient to scratch ordinary glass, no cleavage, and a white streak; avoid relying on color alone. Common sources include Brazil, Madagascar, the United States, and many other regions.
