sedimentary
Sandstone Beach Pebble
Clastic sedimentary rock (SiO2 with iron oxide cement)
Hardness: 6-7 (if quartz-based); Color: Tan/yellowish-brown; Luster: Dull/earthy; Texture: Fine-grained, gritty/sand-like; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (if quartz-based)
- Color
- Tan/yellowish-brown
- Luster
- Dull/earthy
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Physical properties
Hardness: 6-7 (if quartz-based); Color: Tan/yellowish-brown; Luster: Dull/earthy; Texture: Fine-grained, gritty/sand-like; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years. This specific specimen has been rounded and smoothed by mechanical weathering from waves and tides in a beach environment.
Uses & applications
Common sandstones are used for building stone, paving, and decorative garden landscaping. In crushed form, it is used for concrete and glass manufacturing.
Geological facts
Sandstone accounts for about 20% of all sedimentary rocks on Earth. The distinct layering (stratification) visible in some specimens represents the original depositional environment, such as ancient riverbeds or sand dunes.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally on coastlines and riverbeds. For collectors, search for 'ventifacts' or uniquely shaped river-tumbled stones.
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