sedimentary
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
Hardness: 6-7 on Mohs scale; Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Granular (sand-sized grains); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, beige, or light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Granular (sand-sized grains); Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of mineral particles or rock fragments. This specimen has been rounded by wave action and beach erosion over decades or centuries.
Uses & applications
Commonly used in construction, as a building stone, in glass manufacturing, and as decorative landscape material.
Geological facts
Sandstone makes up about 20% to 25% of all sedimentary rocks. It is highly porous and often acts as a natural aquifer for groundwater or a reservoir for oil and gas.
Field identification & locations
Identify in the field by the visible sand grains and gritty texture (like sandpaper). This rounded shape is characteristic of 'cobbles' found in riverbeds or on energetic coastline beaches.
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