sedimentary

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Grayish-green to tan; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2–2.8

Hardness: 6-7 Mohs
Color: Grayish-green to tan
Luster: Dull/Earthy

Identified April 24, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Grayish-green to tan; 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 mineral particles or rock fragments. This specimen appears to be a lithic sandstone, likely formed in a marine or river environment where sand-sized grains were compressed over millions of years.

Uses & applications

Commonly used in construction as a building material, for paving, or as crushed stone. Also used in glass manufacturing if silica content is high enough.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. It is a major reservoir for groundwater and petroleum because of its porosity.

Field identification & locations

Identify in the field by its 'sandpaper' feel and visible grains. It will not fizz with acid unless it has a calcitic cement. Found globally in basins and coastal regions.