sedimentary
Sandstone (likely Siltstone)
Arenite or Siltstone (high SiO2 content)
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
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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.
Field identification & locations
Identify in the field by its gritty texture (like sandpaper) and visible layering or banding. Common globally in sedimentary basins and riverbeds.
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