sedimentary
Sandstone (Green/Yellow Siltstone variant)
Arenite or Siltstone (primarily SiO2 with mineral staining)
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
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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.
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