sedimentary

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 dominated)

AI-generated identification · may be incorrect

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

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

Identified June 22, 2026More sedimentary →

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Physical properties

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

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in riverbeds, lakes, or marine environments. Age varies by location but can range from recent to billions of years old.

Uses & applications

Used primarily as construction aggregate, road base, and decorative landscaping stone. High-quality sandstone is used in masonry and architecture.

Geological facts

Sandstone accounts for about 20% of all sedimentary rocks on Earth. It is a major reservoir for groundwater and petroleum due to its porosity.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in outcrops, riverbeds, and as common gravel. Collectors look for unique banding or fossil inclusions.