sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale); Color: tan, yellow-brown, and grey with iron oxide staining; Luster: dull to earthy; Structure: clastic/granular texture with visible sand grains; Cleavage: none; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- tan, yellow-brown, and grey with iron oxide staining
- Luster
- dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: tan, yellow-brown, and grey with iron oxide staining; Luster: dull to earthy; Structure: clastic/granular texture with visible sand grains; Cleavage: none; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specific specimen has been subsequentely weathered and rounded by water action, likely in a river or stream environment.
Uses & applications
Commonly used as construction material, decorative stone in landscaping, and in the production of glass (if high purity quartz). In this pebble form, it is primarily a collector's curiosity or garden stone.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The distinct colors are often caused by the impurities in the cementing mineral, such as hematite or limonite creating red and yellow hues.
Field identification & locations
Identify in the field by its 'sandpaper' feel and visible tiny grains. It is extremely common in sedimentary basins, riverbeds, and beaches worldwide. This specimen shows significant rounding typical of fluvial transport.
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