sedimentary

Sandstone with Lichen

Arenite (SiO2 based) with biological weathering

AI-generated identification · may be incorrect

Hardness: 6-7 (quartz grains); Color: tan, grey, or brown, often obscured by green/white lichen; Luster: dull to earthy; Structure: clastic/granular; Cleavage: none; SG: 2.2-2.8

Hardness: 6-7 (quartz grains)
Color: tan, grey, or brown, often obscured by green/white lichen
Luster: dull to earthy

Identified June 27, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (quartz grains); Color: tan, grey, or brown, often obscured by green/white lichen; Luster: dull to earthy; Structure: clastic/granular; Cleavage: none; SG: 2.2-2.8

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years in marine or terrestrial environments. The surface shows biological weathering by lichen.

Uses & applications

Used extensively in construction as building stone, flagstone, and for decorative landscaping. Ground sandstone provides silica for glass manufacturing.

Geological facts

Sandstone represents about 20-25% of all sedimentary rocks. The organisms growing on it (lichen) actually help break down the rock into soil through chemical and physical processes.

Field identification & locations

Identify in the field by its gritty, sand-like texture when rubbed. Look for layered bedding planes. Common in desert environments and ancient riverbeds.