sedimentary

Sandstone (likely Siltstone)

Arenite or Siltstone (high SiO2 content)

AI-generated identification · may be incorrect

Hardness: 6-7 (if silica-rich); Color: Tan/brown with darker banding; Luster: Dull/Earthy; Crystal structure: Clastic (microscopic grains); Cleavage: None (conchoidal to irregular fracture).

Hardness: 6-7 (if silica-rich)
Color: Tan/brown with darker banding
Luster: Dull/Earthy

Identified April 1, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (if silica-rich); Color: Tan/brown with darker banding; Luster: Dull/Earthy; Crystal structure: Clastic (microscopic grains); Cleavage: None (conchoidal to irregular fracture).

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments, typically in riverbeds, deltas, or desert environments. The banding suggests seasonal or periodic depositional cycles.

Uses & applications

Common varieties are used in construction, road base, and decorative landscaping. This specific smooth specimen is primarily a collector's pocket stone or garden accent.

Geological facts

Sandstone accounts for roughly 20% of all sedimentary rocks on Earth. The darker lines, known as 'herringbone cross-stratification' in some cases, can indicate the direction of ancient water currents.