sedimentary
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
Hardness: 7 (Mohs scale if quartz-based); Color: Tan, beige, or white; Luster: Dull to vitreous; Crystal structure: Usually microcrystalline or amorphous due to weathering; Cleavage: None
- Hardness
- 7 (Mohs scale if quartz-based)
- Color
- Tan, beige, or white
- Luster
- Dull to vitreous
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Physical properties
Hardness: 7 (Mohs scale if quartz-based); Color: Tan, beige, or white; Luster: Dull to vitreous; Crystal structure: Usually microcrystalline or amorphous due to weathering; Cleavage: None
Formation & geological history
Formed through the mechanical and chemical weathering of larger igneous or metamorphic rocks like granite. These are small fragments transported by water or wind and deposited as sediment.
Uses & applications
Used in the production of concrete, glass manufacturing, road construction, filtration systems, and as an abrasive.
Geological facts
Most sand is composed of silica (quartz). Over millions of years, these small grains can become compacted and cemented to form sandstone.
Field identification & locations
Identify by granular texture and lack of organic structure. Found globally in riverbeds, beaches, and deserts. In a home setting, these are often track-in debris or components of construction materials.
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