sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 (individual grains); Color: Buff, light tan, or off-white; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (individual grains)
- Color
- Buff, light tan, or off-white
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (individual grains); Color: Buff, light tan, or off-white; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz or feldspar. This specimen shows signs of water erosion/smoothing, suggesting a river or coastal environment origin.
Uses & applications
Used widely in construction and masonry, glass making (if pure silica), and as a filtration medium or for sharpening tools.
Geological facts
Sandstone makes up about 10-20% of the Earth's sedimentary rocks and is a major reservoir for groundwater and petroleum due to its porosity.
Field identification & locations
Identify in the field by its 'sandpaper' texture and visible grains. It is often found in desert regions, ancient river beds, and cliffsides. This specific piece is notable for its 'foot-like' or 'boot' shape.
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