sedimentary

Sandstone (lithic wake/graywacke variety)

Arenite/Greywacke (SiO2 with lithic fragments)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Gray to brownish-gray; Luster: Dull/Earthy; Crystal Structure: Clastic (granular); Cleavage: None (fractures irregularly); Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Gray to brownish-gray
Luster: Dull/Earthy

Identified June 7, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Gray to brownish-gray; Luster: Dull/Earthy; Crystal Structure: Clastic (granular); Cleavage: None (fractures irregularly); Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and lithification of sand-sized mineral particles or rock fragments. This specimen appears to be a graywacke, typically formed in deep-water marine environments via turbidity currents.

Uses & applications

Commonly used as construction aggregate, road base, and occasionally as dimension stone for landscaping or building veneers.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. Graywacke varieties are often called 'dirty sandstone' because of the high concentration of clay and diverse rock fragments mixed with quartz.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible grains. It is commonly found in sedimentary basins and mountain belts. Collectors look for unique banding or fossil inclusions.