sedimentary

Weathered feldspathic sandstone

Quartz–feldspar arenite, likely iron-oxide stained

AI-generated identification · may be incorrect

Tan to rusty orange, fine- to medium-grained, dull earthy luster, and visibly granular texture with bluish-gray mineral or vein bands. Dominated by quartz and feldspar with iron-oxide cement; typical hardness is about 6–7 for individual grains, with no obvious cleavage.

Identified August 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented into sandstone, probably in a fluvial or coastal setting; rusty coloration reflects later oxidation of iron-bearing minerals. Its precise geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and decorative material; this weathered specimen has modest educational or collection value.

Geological facts

The blue-gray bands may be altered feldspar, clay-rich seams, or thin mineral veins rather than true blue minerals. Surface weathering preferentially highlights iron-rich zones and fractures.

Field identification & locations

Identify it by gritty texture, visible sand grains, layered or streaked fabric, and weak reaction to dilute acid unless carbonate cement is present. Common worldwide, especially in sedimentary basins; estimated value is about $1–$15 as a loose specimen, or up to $20–$40 if the banding is unusually attractive.