sedimentary

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Tan to light brown with visible layering, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic texture, Mineralogy: Mostly quartz grains with some feldspar and iron oxide cement.

Identified March 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Clastic particles are deposited by water, wind, or ice and then lithified under pressure. This specimen shows significant rounding, suggesting a fluvial (river) or beach origin where it was tumbled by water.

Uses & applications

Commonly used as a building material, paving stone, and in the production of glass (if high quartz purity). It also serves as a significant reservoir rock for groundwater and petroleum.

Geological facts

Sandstone makes up about 10-20% of the Earth's sedimentary rocks. Its color is often determined by the cementing material; the brownish hue in this specimen suggests a presence of iron oxide (hematite or limonite).

Field identification & locations

Identify in the field by its 'sandpaper' feel and visible bedding planes (layering). It can be found globally in riverbeds, deserts, and coastal regions. For collectors, look for cross-bedding or fossil inclusions.