Sandstone (Quartzose Sandstone)

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.

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.

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.

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).

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.