Sandstone (Quartzite-rich)

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Tan, brown, and ochre with visible iron-oxide staining; Luster: Dull to earthy; Crystal structure: Granular/clastic texture; Cleavage: None; Specific gravity: Approx 2.65.

Formation & Geological History

Formed through the accumulation and cementation of mineral particles (lithification) of sand-sized grains. This specimen shows significant rounding, suggesting a fluvial (river) or coastal origin where water energy smoothed the edges over time.

Uses & Applications

Used in construction as a building material, in the glass-making industry (if pure quartz), and as decorative landscaping stones or garden features.

Geological Facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The red/orange tints in this specific rock are caused by the oxidation of iron minerals, essentially acting as a natural rust that cements the sand grains together.

Field Identification & Locations

Identify in the field by its 'sandpaper' feel and visible grains. It is commonly found in riverbeds, canyons, and desert environments mapping ancient coastlines. Look for bedding planes or layers which are often visible in larger outcrops.

Identified on: 4/19/2026

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