sedimentary

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone (SiO₂-dominated), possibly metamorphosed to quartzite

AI-generated identification · may be incorrect

Tan-orange, granular and iron-oxide stained, with dull to slightly earthy luster and no obvious crystals or cleavage. Quartz-rich sandstone has Mohs hardness about 6–7; quartzite is harder and more resistant, with specific gravity around 2.6.

Identified September 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely deposited as sand in an ancient river, shoreline, dune, or sedimentary basin, then lithified; orange coloration comes from oxidized iron minerals. If quartzite, later burial and metamorphism recrystallized the sandstone; exact age cannot be determined from the image.

Uses & applications

Used as building stone, paving, aggregate, and landscaping material; attractive pieces may be collected as ornamental specimens. It has little gemstone value unless unusually patterned or fossiliferous.

Geological facts

The apparent rounded grains and rusty staining suggest quartz-rich sandstone, while the massive, very hard texture would favor quartzite. Surface weathering can obscure bedding and make visual identification uncertain.

Field identification & locations

Common in continental sedimentary basins and metamorphic mountain belts worldwide. Look for visible sand grains and bedding for sandstone; a sugary, fused texture that scratches glass strongly suggests quartzite.