mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; opaque white to cream with a vitreous-to-waxy luster and irregular fracture. Trigonal crystal structure; no cleavage; specific gravity about 2.65. The rounded shape indicates natural water wear or tumbling.
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Physical properties
Hardness 7 Mohs; opaque white to cream with a vitreous-to-waxy luster and irregular fracture. Trigonal crystal structure; no cleavage; specific gravity about 2.65. The rounded shape indicates natural water wear or tumbling.
Formation & geological history
Quartz crystallized from silica-rich fluids or cooled magma, then became rounded through transport by water or abrasion. Quartz occurs in rocks of many geological ages.
Uses & applications
Commonly used as decorative stone, aggregate, and a source of silica; attractive pieces may be polished for jewelry or collecting.
Geological facts
Quartz is one of Earth’s most abundant minerals and resists weathering, allowing it to persist in river and beach gravels.
Field identification & locations
Identify by its glassy/waxy appearance, lack of cleavage, and ability to scratch ordinary glass; the image alone cannot confirm its exact variety. Found worldwide in veins, igneous and metamorphic rocks, and sediments.
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Epidote
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Granite
Granite (Phaneritic intrusive igneous rock)
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