sedimentary

Likely weathered sandstone or metasandstone

Quartz-rich sandstone (possibly weakly metamorphosed metasandstone)

AI-generated identification · may be incorrect

Pinkish-tan, fine- to medium-grained, strongly weathered and thinly layered, with dull earthy luster and no obvious crystals or cleavage. Estimated Mohs hardness 6–7; quartz-rich sandstone commonly has specific gravity around 2.2–2.7.

Identified September 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted and cemented sand, likely later uplifted, fractured, and weathered. The image cannot establish a geological age; Taiwan’s Central Mountain region includes highly deformed sedimentary and metamorphic rocks, commonly Cenozoic in age.

Uses & applications

Crushed sandstone is used as aggregate and construction fill; attractive slabs may be used decoratively, though this specimen appears ordinary and weathered.

Geological facts

The reddish color commonly reflects iron-oxide staining of quartz and feldspar grains. Layering and splintery fracture can indicate bedding or low-grade metamorphic deformation.

Field identification & locations

Look for visible sand grains, gritty texture, bedding, and a weak reaction or no reaction to dilute hydrochloric acid. Near 24.0°N, 121.6°E, this is regionally plausible, but a field photo cannot distinguish sandstone from slate, phyllite, or altered volcanic rock with confidence.