sedimentary

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Tan, grey, or brownish; Luster: Dull/Earthy; Crystal structure: Granular (sand-sized grains); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, grey, or brownish
Luster: Dull/Earthy

Identified June 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, grey, or brownish; Luster: Dull/Earthy; Crystal structure: Granular (sand-sized grains); 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 in riverbeds, beaches, or deserts. This specific specimen has been water-worn into a smooth river pebble shape over hundreds to thousands of years.

Uses & applications

Used in construction as a building material, in the glass industry (if high silica content), and frequently as decorative landscaping stones or river rock.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. It acts as a primary aquifer, storing significant amounts of groundwater and oil due to its inherent porosity.

Field identification & locations

Identify by its 'sandpaper' feel (even when smooth) and visible granular texture. Commonly found in riverbeds, coastal areas, and ancient sedimentary basins. Collectors often look for colorful banding or fossil inclusions.