sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: reddish-brown to tan; Luster: matte/dull; Structure: clastic/granular; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: reddish-brown to tan
Luster: matte/dull

Identified May 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: reddish-brown to tan; Luster: matte/dull; Structure: clastic/granular; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz and feldspar, in environments like riverbeds, deserts, or marine basins. The reddish hue indicates iron oxide cementation.

Uses & applications

Commonly used as a building material, paving stones, and for ornamental rock in landscaping. Finely crushed sandstone is used in glassmaking.

Geological facts

Sandstone can preserve fossil footprints and ripple marks from ancient environments. It is one of the most common types of sedimentary rock on Earth's crust.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible layering (bedding planes). Found globally in sedimentary basins. Collectors often look for unique erosion patterns or banding (Liesegang rings).