sedimentary

Weathered sandstone

Quartz-rich sandstone, locally iron-oxide stained (SiO₂-dominant)

AI-generated identification · may be incorrect

Medium- to coarse-grained, brown to gray rock with rusty orange surface staining from hematite/limonite; typically gritty, dull to subvitreous, and composed mainly of quartz with feldspar and rock fragments. Hardness is about 6–7 for quartz grains, with no prominent cleavage; bedding or jointing is visible.

Identified August 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Lithified sand deposited by rivers, dunes, or shallow marine environments, then compacted and cemented by silica, calcite, or iron oxides. The exposed rusty colors result from weathering; exact age cannot be determined from the image.

Uses & applications

Used as building stone, paving, aggregate, and landscaping material; attractive blocks may be used decoratively. Ordinary outcrops generally have little collector value.

Geological facts

Iron staining can produce striking red, orange, and purple bands. Differential weathering along fractures may create large boulders and cavern-like openings.

Field identification & locations

Look for visible sand grains, gritty texture, sedimentary layering, and rusty iron-oxide coatings; it should not fizz strongly in dilute acid unless carbonate cement is present. Common worldwide in desert, river, coastal, and sedimentary-basin exposures.