sedimentary
Sandstone Pebble
Arenite (SiO2 with minor mineral cements)
Hardness: 6-7 (if quartz-based); Color: tan, grey, cream; Luster: dull; Crystal structure: granular clastic texture; Specific gravity: 2.3-2.6.
- Hardness
- 6-7 (if quartz-based)
- Color
- tan, grey, cream
- Luster
- dull
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Physical properties
Hardness: 6-7 (if quartz-based); Color: tan, grey, cream; Luster: dull; Crystal structure: granular clastic texture; Specific gravity: 2.3-2.6.
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral grains or rock fragments, typically in riverbeds, beaches, or desert environments. This specimen shows significant rounding from water erosion (fluvial or marine).
Uses & applications
Used in construction, landscaping, as an abrasive, and for making glass if the silica content is high. In this form, it is primarily a decorative or geological collecting item.
Geological facts
Sandstone can preserve fossilized footprints and ripple marks from ancient environments. It is one of the most common types of sedimentary rock on Earth.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Primarily found in old riverbeds or along coastlines. It will not fizz with acid unless it contains calcite cement.
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Sandstone
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