sedimentary
Sand and Gravel (Quartz-rich)
Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)
Hardness: 7 (for quartz components); Color: Tan, brown, white, and grey; Luster: Dull to vitreous; Structure: Granular/fragmental; Cleavage: None
- Hardness
- 7 (for quartz components)
- Color
- Tan, brown, white, and grey
- Luster
- Dull to vitreous
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Physical properties
Hardness: 7 (for quartz components); Color: Tan, brown, white, and grey; Luster: Dull to vitreous; Structure: Granular/fragmental; Cleavage: None
Formation & geological history
Formed through the weathering and erosion of pre-existing igneous, metamorphic, and sedimentary rocks. These fragments are transported by water and deposited in low-energy environments like beaches or riverbeds.
Uses & applications
Used extensively 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. Most beach sand is composed of quartz because it is chemically stable and physically hard enough to resist weathering.
Field identification & locations
Identify by granular texture and varied mineral composition. Common in coastal areas, river banks, and glaciated regions. Collectors look for unique inclusions or semi-precious pebbles like jasper or agate within the mix.
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