sedimentary
Tumbled River Stone
Siliciclastic rock (Quartzite or Quartz-rich sandstone)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, brownish-gray color, dull to sub-vitreous luster, compact granular crystal structure, no distinct cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, brownish-gray color, dull to sub-vitreous luster, compact granular crystal structure, no distinct cleavage, specific gravity around 2.65.
Formation & geological history
Formed through the mechanical weathering, transportation, and aqueous abrasion of quartz-rich parent rocks over thousands to millions of years in fluvial environments.
Uses & applications
Used primarily in landscaping, garden decoration, aquascaping, and occasionally tumbled for decorative stones.
Geological facts
River stones acquire their smooth, rounded shape through constant tumbling and friction against other sediments in fast-flowing water.
Field identification & locations
Identified in the field by its smooth, water-worn exterior and high resistance to scratching due to quartz content; found globally in riverbeds and ancient alluvial deposits.
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