sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 Mohs; Color: Tan/light brown; Luster: Dull/Earthy; Texture: Fine-grained, gritty, well-rounded clasts; Cleavage: None
- Hardness
- 6-7 Mohs
- Color
- Tan/light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan/light brown; Luster: Dull/Earthy; Texture: Fine-grained, gritty, well-rounded clasts; Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, typically in riverbeds, beaches, or deserts. This specimen shows river-worn rounding (alluvial transport).
Uses & applications
Commonly used in construction, as a building stone, in landscaping, and as an abrasive in industrial glass making.
Geological facts
Sandstone makes up about 10-25% of the Earth's sedimentary rocks. Many significant archaeological structures, like Petra in Jordan, are carved entirely from sandstone.
Field identification & locations
Identify by its 'sandpaper' feel and visible grains. Often found in dry creek beds or areas with ancient sedimentary deposits. Collectors look for unique banding (Liesegang rings).
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