sedimentary

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

Hardness: 6-7 (if quartz-rich); Color: Greyish-tan to light green; Luster: Dull/Earthy; Structure: Clastic with visible sand grains; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (if quartz-rich)
Color: Greyish-tan to light green
Luster: Dull/Earthy

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (if quartz-rich); Color: Greyish-tan to light green; Luster: Dull/Earthy; Structure: Clastic with visible sand grains; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in river beds, beaches, or deserts.

Uses & applications

Commonly used in construction, as a building material, for paving stones, and as an industrial source of silica in glassmaking.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The unique swirls and patterns often seen are known as Liesegang rings, caused by mineral precipitation.

Field identification & locations

Identify in the field by its gritty 'sandpaper' feel. It is commonly found in sedimentary basins and along coastal cliffs. For collectors, it is usually categorized by its texture and color.