mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectLikely Mohs hardness 7; pale gray-white and translucent, with a vitreous to waxy polish. Trigonal crystal system, no cleavage, and uneven to conchoidal fracture; small dark inclusions may be other minerals.
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Physical properties
Likely Mohs hardness 7; pale gray-white and translucent, with a vitreous to waxy polish. Trigonal crystal system, no cleavage, and uneven to conchoidal fracture; small dark inclusions may be other minerals.
Formation & geological history
Quartz forms in igneous and metamorphic rocks and from silica-rich fluids in veins; this pebble has been mechanically tumbled and polished. Quartz is widespread across geologic ages.
Uses & applications
Used in jewelry, ornaments, countertops, glassmaking, and electronics; this small piece is mainly decorative or collectible.
Geological facts
Quartz is one of Earth’s most abundant minerals and occurs in many varieties, including amethyst and agate.
Field identification & locations
Identify by its glassy luster, translucence, hardness, and lack of cleavage; common worldwide in veins, pegmatites, and river gravels. The smooth rounded surface indicates polishing rather than natural crystal faces.
