sedimentary
Sandstone (with banding/weathering)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 (on Mohs scale); Color: Tan, brown, gray, and earthy ochre; Luster: Dull/Earthy; Crystal Structure: Clastic (grain-based); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (on Mohs scale)
- Color
- Tan, brown, gray, and earthy ochre
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Tan, brown, gray, and earthy ochre; Luster: Dull/Earthy; Crystal Structure: Clastic (grain-based); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral grains or rock fragments (sand) over millions of years. This specimen shows distinct bedding planes and surface weathering, likely from a fluvial or deltaic environment.
Uses & applications
Commonly used in the construction industry as a building material and paving stone; also used as a reservoir rock in the petroleum industry and as a source of silica for glass making.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The visible stripes or bands represent different periods of sediment deposition, which can act as a geological record of ancient environments.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and visible layers (stratification). It is found globally, notably in the Southwestern United States and the United Kingdom. Collectors should look for unique cross-bedding or fossil inclusions.
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