sedimentary

Sandstone (Quartz Sandstone / Iron-stained Sandstone)

Sandstone (SiO2 with iron oxide impurities)

Hardness: 6-7 on Mohs scale (due to quartz grains); Color: Tan, brown, reddish-brown; Luster: Dull, earthy; Texture: Medium-grained, granular sand-like texture; Cleavage: None

Hardness: 6-7 on Mohs scale (due to quartz grains)
Color: Tan, brown, reddish-brown
Luster: Dull, earthy

Identified July 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale (due to quartz grains); Color: Tan, brown, reddish-brown; Luster: Dull, earthy; Texture: Medium-grained, granular sand-like texture; Cleavage: None

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral particles or rock fragments, typically composed of quartz and feldspar. Sandstone deposits form in environments like rivers, lakes, deserts, and shallow marine areas over millions of years.

Uses & applications

Commonly used in construction, paving, landscaping, and ornamental stone carving. Highly weathered field specimens are gathered for personal collections.

Geological facts

Sandstone often preserves sedimentary structures such as ripple marks or cross-bedding. Iron oxide minerals like hematite or goethite give many sandstones their characteristic reddish-brown or tan colors.

Field identification & locations

Field identification is based on the visible gritty sand grains and rough texture. Can be found globally in alluvial beds, river banks, coastal regions, and exposed rock formations.

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