sedimentary
Sandstone (Quartzite-rich Pebble)
Arenite (primarily SiO2)
Hardness: 6-7 on Mohs scale; Color: Cream, tan, or off-white; Luster: Dull to grainy; Crystal structure: Clastic (composed of cemented sand grains); Cleavage: None; Specific gravity: Approx 2.65.
- Hardness
- 6-7 on Mohs scale
- Color
- Cream, tan, or off-white
- Luster
- Dull to grainy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Cream, tan, or off-white; Luster: Dull to grainy; Crystal structure: Clastic (composed of cemented sand grains); Cleavage: None; Specific gravity: Approx 2.65.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, mostly quartz. This specific rounded specimen has been weathered and smoothed by water action in a river or coastal environment.
Uses & applications
Used primarily as construction aggregate, in glass manufacturing if high purity, or as decorative garden stone.
Geological facts
Sandstone accounts for about 10-20% of all sedimentary rocks on Earth. Over time, under intense heat and pressure, this rock can metamorphose into quartzite.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and its ability to scratch glass if identifying quartz grains. Commonly found in riverbeds, beaches, and desert outcrops.
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