sedimentary

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone; possibly weakly metamorphosed quartzite (SiO₂-dominant)

AI-generated identification · may be incorrect

Tan to orange-brown, coarse-grained, dull to slightly gritty luster, with gray quartz-rich areas and orange iron-oxide staining. Quartz has Mohs hardness 7; the specimen appears granular and lacks visible cleavage, though its exact texture is difficult to confirm from the image.

Identified August 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Most likely deposited as sand, lithified by compaction and silica cement, then weathered and oxidized; if quartzite, later metamorphosed from sandstone. An exact geological age and locality cannot be determined from the photograph.

Uses & applications

Sandstone is used for building stone, paving, landscaping, and aggregate; quartzite is used for countertops, decorative stone, and aggregate. This rough fragment has little jewelry value.

Geological facts

The orange coloration commonly comes from hematite or goethite coatings between quartz grains. Quartzite generally breaks across grains, whereas sandstone often crumbles or breaks around grains.

Field identification & locations

Look for visible sand grains, gritty texture, bedding, and easy grain release for sandstone; fused interlocking quartz grains and very hard fracture suggest quartzite. Common worldwide in sedimentary basins and metamorphic belts.