sedimentary

Weathered feldspathic sandstone

Quartz–feldspar arenite, likely arkose

AI-generated identification · may be incorrect

Hardness about 6–7 for quartz grains; pink, tan, cream, and brown; generally dull to faintly gritty/vitreous; clastic granular texture with weak bedding and iron-oxide staining. Individual grains may show quartz and feldspar, but cleavage is not visible in the rock mass.

Identified September 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Cemented sand deposited in a river, alluvial-fan, or arid basin, then lithified by compaction and silica/iron-oxide cement. Exact geological age cannot be determined from the photograph; arkoses commonly form near eroding granitic uplands.

Uses & applications

Used locally as building stone, decorative landscaping stone, and aggregate; attractive pieces may be collected, though it is not normally a jewelry material.

Geological facts

The pink coloration commonly reflects potassium feldspar, while reddish-brown tones usually come from hematite coatings. Strong color bands may represent original sedimentary layering or weathering zones.

Field identification & locations

Look for visible sand grains, gritty fracture, bedding, and abundant pink feldspar; a steel nail should not easily scratch quartz-rich areas. Common in sedimentary basins worldwide, especially near granite source rocks.