sedimentary

Sandstone Clast

Arenite (primarily SiO2)

Hardness: 6-7 (Mohs scale); Color: tan, beige, or light brown; Luster: dull/earthy; Crystal structure: clastic/granular texture with visible sand grains; Cleavage: none; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: tan, beige, or light brown
Luster: dull/earthy

Identified March 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: tan, beige, or light brown; Luster: dull/earthy; Crystal structure: clastic/granular texture with visible sand grains; Cleavage: none; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments. These typically originate in river beds, beaches, or desert environments. Age varies based on localized stratigraphy, often ranging from millions to billions of years old.

Uses & applications

Used widely as a construction material (dimension stone), in glass manufacturing if silica content is high, for road base material, and occasionally for simple garden landscaping or decorative gravel.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. It often preserves ancient surface features like ripple marks from water or wind, as well as fossils in certain conditions.

Field identification & locations

Identify in the field by its gritty 'sandpaper' feel and visible grain structure. Commonly found in riverbeds, outcroppings, and coastal areas globally. Collectors should look for unique cross-bedding or fossil inclusions.