sedimentary
Sandstone (Stream-rounded)
Arenite (SiO2 based)
Hardness: 6-7 (Mohs); Color: Brown to tan with dark inclusions; Luster: Dull/Earthy; Crystal structure: Granular (clastic texture); Cleavage: None; Specific gravity: 2.3-2.6
- Hardness
- 6-7 (Mohs)
- Color
- Brown to tan with dark inclusions
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Brown to tan with dark inclusions; Luster: Dull/Earthy; Crystal structure: Granular (clastic texture); Cleavage: None; Specific gravity: 2.3-2.6
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral particles or rock fragments. This specific specimen shows significant fluvial erosion (rounding by water), likely dating from the Holocene to Pleistocene epochs.
Uses & applications
Common varieties are used in construction, road base, and as decorative landscaping stones. Highly pure quartz sandstones are used in glass manufacturing.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Its porosity makes it a critical reservoir rock for groundwater, oil, and natural gas.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in riverbeds, beaches, and desert outcrops. For collectors, look for unique weathering patterns or fossil inclusions.
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