sedimentary
Sandstone (Stream-Rolled)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 (Mohs); Color: Tan, beige, light brown; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Specific Gravity: 2.2-2.8. Features a smooth, oblong shape due to water erosion.
- Hardness
- 6-7 (Mohs)
- Color
- Tan, beige, light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, beige, light brown; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Specific Gravity: 2.2-2.8. Features a smooth, oblong shape due to water erosion.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, primarily quartz. This specific specimen has been shaped and smoothed over thousands of years by fluvial (river) or coastal water movement.
Uses & applications
Commonly used in construction, landscaping, and as an abrasive. Smooth river stones are popular for decorative garden use and 'worry stones'.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. It is an excellent aquifer, often holding large quantities of groundwater or oil in its porous structure.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grain structure. Commonly found in riverbeds, canyons, and coastal areas. Collectors look for unique shapes or fossils contained within.
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