sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (on Mohs scale); Color: Brownish-tan to reddish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific Gravity: 2.2 - 2.8

Hardness: 6-7 (on Mohs scale)
Color: Brownish-tan to reddish-brown
Luster: Dull/Earthy

Identified June 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (on Mohs scale); Color: Brownish-tan to reddish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); 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 desert, river, or coastal environments. This specific specimen shows signs of iron oxide staining and weathering over thousands to millions of years.

Uses & applications

Used widely in construction (building stone/flagstone), as an abrasive in glass making, and as a reservoir rock for groundwater and petroleum.

Geological facts

Sandstone makes up about 20 to 25 percent of all sedimentary rocks on Earth. The famous red rock formations in Sedona, Arizona and the Grand Canyon are composed primarily of various types of sandstone.

Field identification & locations

Identify by its 'sandpaper' feel and visible grains. Often found in outcrops, riverbeds, and quarries. For collectors, look for unique patterns like cross-bedding or fossil inclusions.