sedimentary
Coarse Sand and River Gravel
Siliciclastic Sediment (primarily Quartz and Feldspar)
Hardness: variable (mostly 6-7), Color: multi-colored (tan, brown, grey, white), Luster: earthy to vitreous, Grain size: 1mm to 10mm, Shape: sub-rounded to sub-angular
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Physical properties
Hardness: variable (mostly 6-7), Color: multi-colored (tan, brown, grey, white), Luster: earthy to vitreous, Grain size: 1mm to 10mm, Shape: sub-rounded to sub-angular
Formation & geological history
Formed through the mechanical weathering and erosion of bedrock, transported by water or wind. Found in riverbeds, deltas, and glacial outwash plains. Ages range from Holocene to millions of years old.
Uses & applications
Extensively used in construction for concrete and mortar, glass manufacturing, sandblasting, and water filtration.
Geological facts
Sand is the second most used natural resource in the world after water. Quartz is the most common mineral in sand because of its chemical stability and high hardness.
Field identification & locations
Identified by grain size (coarser than fine sand, finer than cobbles). Look for areas with active water transport. Abundant globally along coastlines and fluvial systems.
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