sedimentary

Sandstone (Greywacke/Lithic Sandstone)

Clastic Sedimentary Rock (Lithic Sandstone)

AI-generated identification · may be incorrect

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

Identified June 28, 2026More sedimentary →

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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.