sedimentary
Sandstone (Pebble)
Sandstone (composed mainly of Quartz, SiO2, with feldspar and lithic fragments)
Hardness: 6-7 on Mohs scale (due to quartz contents); Color: Greyish-brown with visible fine grains; Luster: Dull/earthy; Texture: Fine to medium-grained, rough sandpaper-like feel, rounded by water erosion; Cleavage: None.
- Hardness
- 6-7 on Mohs scale (due to quartz contents)
- Color
- Greyish-brown with visible fine grains
- Luster
- Dull/earthy
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Physical properties
Hardness: 6-7 on Mohs scale (due to quartz contents); Color: Greyish-brown with visible fine grains; Luster: Dull/earthy; Texture: Fine to medium-grained, rough sandpaper-like feel, rounded by water erosion; Cleavage: None.
Formation & geological history
Formed by the compaction and cementation of mineral particles or rock fragments in beach, river, or desert environments, followed by natural rounding due to wave or stream action (beach/river pebble).
Uses & applications
Commonly used as construction aggregate, landscaping pebbles, decorative stones, or for crafting and pocket stones.
Geological facts
Naturally heart-shaped or rounded pebbles are shaped over hundreds or thousands of years by the abrasive action of moving water and sand in riverbeds or coastal shores.
Field identification & locations
Identified by its gritty surface texture and granular appearance. Commonly found along stream beds, rivers, lake shores, and ocean beaches worldwide.
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