sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, beige, or light brown; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: approx. 2.2-2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, beige, or light brown
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, beige, or light brown; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: approx. 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) the size of sand. This specimen shows signs of water erosion (river-worn smoothing).
Uses & applications
Used widely in construction as a building stone or road base; if pure quartz, it can be used for glassmaking.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The reddish or tan colors often come from iron oxide impurities.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in riverbeds, deserts, and coastal areas.
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