sedimentary
Sandstone (with vugs or solution cavities)
Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)
Hardness: 6-7 (individual grains); Color: Buff, tan, or light brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (individual grains)
- Color
- Buff, tan, or light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (individual grains); Color: Buff, tan, or light brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, often in riverbeds, deserts, or marine environments. The large cavities (vugs) are likely formed by the dissolution of more soluble inclusions like calcite or fossil fragments.
Uses & applications
Commonly used in construction as a building stone or paving material; also used in glass manufacturing if the quartz purity is high.
Geological facts
Sandstone acts as a natural aquifer and often stores significant reserves of petroleum and natural gas due to its porosity.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in sedimentary basins. Collectors often look for unique erosion patterns or fossil inclusions within the matrix.
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