sedimentary

Sandstone (Green/Yellow Siltstone variant)

Arenite or Siltstone (primarily SiO2 with mineral staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Pale yellow-green with mossy overtones; Luster: Dull/Earthy; Crystal Structure: Clastic (grainy); Cleavage: None; Specific Gravity: 2.2-2.8.

Hardness: 6-7 (Mohs)
Color: Pale yellow-green with mossy overtones
Luster: Dull/Earthy

Identified March 18, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Pale yellow-green with mossy overtones; Luster: Dull/Earthy; Crystal Structure: Clastic (grainy); Cleavage: None; Specific Gravity: 2.2-2.8.

Formation & geological history

Formed by the accumulation and lithification of sand-sized mineral grains or rock fragments. The greenish tint is often due to the presence of chlorite, glauconite, or iron reduction in anaerobic conditions. Found in riverbeds or prehistoric marine basins.

Uses & applications

Commonly used in landscaping, as construction aggregate, or as flagstone. Rounded river stones like this are popular for xeriscaping and garden decor.

Geological facts

Sandstone makes up about 10-20% of all sedimentary rocks on Earth. This specific specimen shows signs of mechanical weathering (rounding) from water transport, likely in an ancient or modern stream.

Field identification & locations

Identify by its 'sandpaper' texture and visible fine grains. In the field, it often appears in layered beds (strata). For collectors, seek pieces with interesting mineral staining or patterns like Liesegang rings.