sedimentary

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Tan, brown, and grey with ochre-colored iron oxidation; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, brown, and grey with ochre-colored iron oxidation
Luster: Dull/Earthy

Identified July 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, brown, and grey with ochre-colored iron oxidation; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; 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 over millions of years, typically in desert, river, or ocean environments. The brown patches indicate secondary oxidation of iron-rich minerals.

Uses & applications

Commonly used as a building material, in paving, for making grindstones, and in the glass manufacturing industry due to high silica content.

Geological facts

Sandstone can preserve fossilized footprints and ripple marks from ancient riverbeds. It makes up approximately 20% of all sedimentary rocks on Earth's crust.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Found globally in sedimentary basins. Collectors look for unique banding (liesegang rings) or fossil inclusions.