sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 Mohs scale; Color: Tan, beige, or light grey; Luster: Dull/Earthy; Crystal structure: Clastic (grain-based); Cleavage: None; Specific gravity: 2.2-2.8. Features a gritty, sandpaper-like texture.

Hardness: 6-7 Mohs scale
Color: Tan, beige, or light grey
Luster: Dull/Earthy

Identified March 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and lithification of sand-sized mineral grains (mostly quartz and feldspar). These grains are typically deposited in desert, river, or coastal environments and cemented over millions of years by minerals like silica or calcium carbonate.

Uses & applications

Extensively used as a building material and decorative stone in construction; crushed sandstone is used as a base for roads and in the manufacturing of glass and ceramics.

Geological facts

Sandstone is one of the most common sedimentary rocks on Earth. The deep linear grooves seen on this specific specimen are likely 'glacial striations' or mechanical abrasions caused by harder rocks scraping across it during transport or movement.

Field identification & locations

Identify in the field by its distinctive gritty feel (like sandpaper) and visible layering (bedding). It is found worldwide, especially in arid regions like the American Southwest. Collectors look for unique wear patterns or fossil inclusions.