mineral
Tumbled quartz-rich stone, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite (metamorphic rock)
AI-generated identification · may be incorrectWhite to cream, translucent edges, vitreous to dull luster, rounded from tumbling or abrasion; quartz hardness is Mohs 7, with no cleavage and conchoidal fracture. The image is insufficient to confirm crystal texture or specific gravity.
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Physical properties
White to cream, translucent edges, vitreous to dull luster, rounded from tumbling or abrasion; quartz hardness is Mohs 7, with no cleavage and conchoidal fracture. The image is insufficient to confirm crystal texture or specific gravity.
Formation & geological history
Quartz forms in igneous, metamorphic, and hydrothermal environments; quartzite forms when quartz sandstone is recrystallized during metamorphism. The specimen’s natural age is indeterminate, while its rounded shape may result from stream wear or polishing.
Uses & applications
Common quartz is used in glass, ceramics, abrasives, electronics, countertops, and decorative objects; attractive pieces are sold as inexpensive lapidary material.
Geological facts
Quartz is one of Earth’s most abundant minerals and is chemically resistant, allowing quartz-rich pebbles to survive extensive weathering.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch ordinary glass, lack of cleavage, and white translucence; acid testing is generally unnecessary. Common worldwide, especially in veins, granitic terrains, quartzite outcrops, and river gravels.
