mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectMohs hardness 7; pale cream to translucent, vitreous-to-waxy luster, with no cleavage and uneven fracture. Quartz has a trigonal crystal structure; the pebble’s rounded shape suggests natural water-wear or tumbling.
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Physical properties
Mohs hardness 7; pale cream to translucent, vitreous-to-waxy luster, with no cleavage and uneven fracture. Quartz has a trigonal crystal structure; the pebble’s rounded shape suggests natural water-wear or tumbling.
Formation & geological history
Quartz forms in many igneous, metamorphic, and sedimentary settings, commonly crystallizing from silica-rich fluids or magma. Its geological age cannot be determined from the image.
Uses & applications
Commonly used for decorative stones, jewelry, countertops, glassmaking, and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals and can occur in many colors depending on inclusions and impurities.
Field identification & locations
The hardness, glassy appearance, and lack of cleavage are typical clues; quartz is widespread worldwide. This rounded specimen may be naturally water-worn or mechanically tumbled.
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