sedimentary

Weathered sandstone fragment

Quartz-rich clastic sandstone (tentative)

AI-generated identification · may be incorrect

Brown to tan, dull to earthy luster, visibly granular and weathered; likely Mohs hardness 6–7 for quartz grains, with variable cement and no obvious cleavage. Porosity and specific gravity cannot be determined reliably from the image.

Identified August 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized grains—commonly quartz and feldspar—were compacted and cemented in a sedimentary basin; its age cannot be determined visually and may range from Paleozoic to recent. The dark surface likely reflects iron-oxide staining or weathering.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally decorative material; this small fragment has mainly educational or modest collecting value.

Geological facts

The rusty brown coloration commonly comes from hematite or limonite coatings. A fresh broken surface would reveal grain size and cement type more clearly than the weathered exterior.

Field identification & locations

Identify it by rubbing a grainy surface, observing sand-sized particles, and testing hardness: quartz-rich sandstone scratches glass but is usually less cohesive than quartzite. Common worldwide, especially in deserts, river deposits, and sedimentary rock formations.