sedimentary
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs); Color: Tan, buff, or light brown; Luster: Dull/Earthy; Texture: Fine-grained, gritty feel; Structure: Clastic
- Hardness
- 6-7 (Mohs)
- Color
- Tan, buff, or light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, buff, or light brown; Luster: Dull/Earthy; Texture: Fine-grained, gritty feel; Structure: Clastic
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears water-worn, likely from a fluvial (river) or coastal environment.
Uses & applications
Commonly used as a building material, decorative stone, or for glass manufacturing if purely quartz-based.
Geological facts
Sandstone accounts for about 10-20% of the Earth's sedimentary rocks. Some sandstones are great aquifers, holding vast amounts of groundwater.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible layering if present. Found globally in riverbeds, deserts, and beaches. Collectors value specimens with unique weathering or rhythmic banding.
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