Sandstone (Quartz-rich)

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Tan, brown, or grayish-yellow; Luster: Dull/Earthy; Crystal structure: Granular clastic; Cleavage: None; Feel: Gritty like sandpaper.

Formation & Geological History

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

Uses & Applications

Used primarily in construction as a building stone, for making grindstones, or as an ornamental landscaping rock.

Geological Facts

Sandstone occupies roughly 20-25% of all sedimentary rocks on Earth. It acts as a massive natural filter and reservoir for groundwater and petroleum.

Field Identification & Locations

Identify in the field by its gritty texture and visible sand grains. It common in areas with ancient dried-up sea beds or river deltas. Wetting the stone often makes the grainy texture more apparent.

Identified on: 4/18/2026

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