sedimentary

Sandstone (Ferruginous)

Arenite (Fe-rich)

Hardness: 6-7 (Mohs); Color: Tan, brown, or grayish with rust-colored weathering; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; SG: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, brown, or grayish with rust-colored weathering
Luster: Dull/Earthy

Identified April 3, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brown, or grayish with rust-colored weathering; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; SG: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The brownish crust suggests iron oxide enrichment (limonite/hematite) from weathering or groundwater precipitation.

Uses & applications

Used in construction as a building stone, in glass manufacturing if pure silica, as a reservoir for groundwater or oil, and for landscaping.

Geological facts

Sandstone makes up approximately 20-25% of all sedimentary rocks on Earth. Some sandstones contain fossilized imprints or cross-bedding indicating ancient river or wind patterns.

Field identification & locations

Identify by its gritty texture (feels like sandpaper). Look for layering or 'bedding' and test for hardness—it should be difficult to scratch with a steel knife if well-cemented.