sedimentary
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic (grains); Specific gravity: 2.2-2.8; Notable surface texture: Parallel ridges suggest possible fossilized wood fragment or trace fossils.
- Hardness
- 6-7 on Mohs scale (due to quartz content)
- Color
- Tan, brownish-grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic (grains); Specific gravity: 2.2-2.8; Notable surface texture: Parallel ridges suggest possible fossilized wood fragment or trace fossils.
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments of sand size (0.0625 to 2 mm). Often deposited in riverbeds, deltas, or beaches. This specimen shows weathering that suggests long-term exposure to water or wind erosion.
Uses & applications
Commonly used as a building material, in the manufacture of glass (if pure silica), and as a reservoir rock for oil and gas. For collectors, specimens with fossils or unique weathering are kept for educational display.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The rhythmic lines on this piece may be 'Liesegang rings' or fossilized structural elements like petrified wood grain or Paleozoic trace fossils.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible bedding planes or layering. It is commonly found in sedimentary basins and along coastlines or dry riverbeds.
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