sedimentary
Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
Hardness: 6-7 (on Mohs scale for individual quartz grains); Color: Tan, grey, brown; Luster: Dull, earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (on Mohs scale for individual quartz grains)
- Color
- Tan, grey, brown
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 (on Mohs scale for individual quartz grains); Color: Tan, grey, brown; Luster: Dull, earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments of sand size (0.0625 to 2 mm). Often found in ancient riverbeds, deserts, or marine environments. This specimen shows surface weathering and possible oxidation.
Uses & applications
Used widely in construction as a building stone, in the manufacture of glass (if pure quartz), and as an abrasive. Specifically used for decorative pavers and tiles.
Geological facts
Sandstone accounts for roughly 20-25 percent of all sedimentary rocks. It is highly porous, making it a critical reservoir rock for water, oil, and natural gas.
Field identification & locations
Identify in the field by its gritty, sandpaper-like texture and visible layered bedding. It is found globally in large sedimentary basins. For collectors, look for unique patterns or fossils within the layers.
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