sedimentary

Quartz Sand/Gravel

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: Clear, white, tan, or gray, Luster: Vitreous/glassy, Structure: Microcrystalline to amorphous (clastic grains), Cleavage: None/Conchoidal fracture.

Identified June 1, 2026More sedimentary →

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Physical properties

Hardness: 7 (Mohs scale), Color: Clear, white, tan, or gray, Luster: Vitreous/glassy, Structure: Microcrystalline to amorphous (clastic grains), Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed through the weathering and erosion of igneous rocks like granite. These grains are transported by wind or water and deposited as sediment. These particles appear to be recent alluvium or beach/river sediment.

Uses & applications

Used in glass making, concrete production, sandblasting, and water filtration. Larger gravel pieces are used for landscaping and drainage.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. These specific grains are likely the remnants of a rock that has been broken down over thousands of years.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage. Look for translucent to opaque grains with rounded or sub-angular edges depending on the level of erosion.