sedimentary

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone; possibly weakly metamorphosed quartzite (SiO₂ with iron-oxide coatings)

AI-generated identification · may be incorrect

Fine- to medium-grained, reddish-orange and cream, earthy to dull luster, granular texture, and irregular fracture; quartz-rich material is about Mohs 6–7, with no obvious cleavage. The image suggests iron-oxide staining and weathering, but exact identification requires a fresh surface and tests.

Identified September 1, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from cemented quartz sand, then stained by oxidized iron-bearing fluids; if quartzite, later metamorphism recrystallized the sandstone. The specimen’s geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and sculpture; quartzite is used as durable construction stone, aggregate, and occasionally decorative material. This small weathered piece has little commercial value.

Geological facts

The orange-red color commonly comes from hematite or limonite coatings between quartz grains. A scratch test, acid test, and examination of grain boundaries can distinguish sandstone from quartzite.

Field identification & locations

Look for visible sand grains and bedding in sandstone versus interlocking grains and very hard fracture surfaces in quartzite; it may occur in sedimentary or metamorphic terrains worldwide. A steel nail should scratch sandstone more readily than quartzite.