sedimentary

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale for quartz grains); Color: Tan, grey, and brown with white/green surface lichen; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None (fractures around grains)

Hardness: 6-7 (Mohs scale for quartz grains)
Color: Tan, grey, and brown with white/green surface lichen
Luster: Dull/Earthy

Identified April 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds, deserts, or marine environments over millions of years (often Paleozoic to Mesozoic era).

Uses & applications

Commonly used as a building material, flagstone for landscaping, glass manufacturing (if high silica), and as a reservoir rock for oil and gas.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. This specific specimen is host to crustose lichen, which contributes to biological weathering over time.

Field identification & locations

Identify in the field by its 'gritty' feel (like sandpaper) and visible bedding planes. Common in arid regions and coastal cliffs. Check for reaction with HCl; if it fizzes, it has a calcitic cement.