sedimentary
Coarse Sand or Fine Gravel
Clastic Sediment (unconsolidated)
Hardness: 6.5-7 (mostly quartz), Color: Tan, grey, and white, Luster: Dull to vitreous, Crystal structure: Amorphous to crystalline aggregates, Cleavage: None
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (mostly quartz), Color: Tan, grey, and white, Luster: Dull to vitreous, Crystal structure: Amorphous to crystalline aggregates, Cleavage: None
Formation & geological history
Formed through the mechanical and chemical weathering of pre-existing rocks, followed by erosion and transport by water or wind. These specimens appear to be recent alluvial or residual grains.
Uses & applications
Used primarily in construction for concrete and mortar, landscaping, and water filtration systems.
Geological facts
This sample represents the building blocks of sedimentary rocks like sandstone. Most grains are likely quartz, the most common and durable mineral on the Earth's surface.
Field identification & locations
Identify by granular texture and lack of cohesion. Commonly found in riverbeds, beaches, and glacial deposits worldwide.
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