sedimentary
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily Quartz and Feldspar)
Hardness: 6-7 (if quartz-dominated); Color: Tan, grey, or off-white; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (if quartz-dominated)
- Color
- Tan, grey, or off-white
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (if quartz-dominated); Color: Tan, grey, 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 mineral particles or rock fragments (clasts) usually in riverbeds, lakes, or oceans. This specific specimen has been rounded by mechanical erosion in a high-energy water environment.
Uses & applications
Common river stones are used for landscaping, construction aggregate, and as decorative features in gardens. Fine-grained sandstone is used as building stone.
Geological facts
Sandstone makes up about 10-20% of all sedimentary rocks on Earth. Its porosity makes it a major reservoir for groundwater and petroleum.
Field identification & locations
Identified by its sandy, gritty texture and the rounded shape indicating transport by water. It is found globally in riverbeds, beaches, and glacial deposits. Collectors value them as 'worry stones' or for rock painting.
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