mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, vitreous-to-waxy luster with rounded tumbled surfaces; hardness Mohs 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. Internal cloudiness commonly comes from microscopic fluid inclusions or fractures.
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Physical properties
White to translucent, vitreous-to-waxy luster with rounded tumbled surfaces; hardness Mohs 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. Internal cloudiness commonly comes from microscopic fluid inclusions or fractures.
Formation & geological history
Likely a naturally quartz-rich pebble that was mechanically rounded, though the image cannot confirm processing. Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; quartz is common from Precambrian to modern deposits.
Uses & applications
Used for lapidary tumbling, ornaments, countertops, glass, ceramics, electronics, and abrasives; translucent attractive pieces have modest decorative value.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric. Milky quartz is typically less valuable than clear rock crystal or gem-quality varieties.
Field identification & locations
Identify by its glassy appearance, lack of cleavage, resistance to scratching by steel, and ability to scratch glass; avoid confusing it with man-made glass, which may show bubbles and softer edges. Common worldwide in veins, pegmatites, river gravels, and granite terrains.
