sedimentary
Sandstone (Greywacke/Lithic Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
Hardness: 6-7 Mohs; Color: Greyish-brown with darker specks; Luster: Dull/Earthy; Crystal Structure: Clastic (fine-grained sand particles); Specific Gravity: 2.3-2.7
- Hardness
- 6-7 Mohs
- Color
- Greyish-brown with darker specks
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Greyish-brown with darker specks; Luster: Dull/Earthy; Crystal Structure: Clastic (fine-grained sand particles); Specific Gravity: 2.3-2.7
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specific rounded shape is common for rocks found in high-energy environments like riverbeds or beaches where water erosion smooths the surface.
Uses & applications
Commonly used in construction as an aggregate, decorative landscaping stone, and historically as building material or grinding stones.
Geological facts
This specimen is a well-rounded beach cobble, showing signs of significant mechanical weathering. It contains a mix of quartz, feldspar, and lithic (rock) fragments cemented together.
Field identification & locations
Identify by its gritty texture (if broken) and visible sand grains. Common on beaches and riverbanks. To identify, look for layering or uniform granular appearance; it will not scratch easily with a copper penny.
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