sedimentary
Sandstone (Micaceous)
Clastic Sedimentary Rock (primarily SiO2 with Mica)
Hardness: 6-7 (Mohs scale for quartz grains); Color: Tan, yellow, or buff; Luster: Dull/Earthy with sparkling mica flecks; Structure: Fine to medium-grained; Cleavage: None (breaks across grains)
- Hardness
- 6-7 (Mohs scale for quartz grains)
- Color
- Tan, yellow, or buff
- Luster
- Dull/Earthy with sparkling mica flecks
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Physical properties
Hardness: 6-7 (Mohs scale for quartz grains); Color: Tan, yellow, or buff; Luster: Dull/Earthy with sparkling mica flecks; Structure: Fine to medium-grained; Cleavage: None (breaks across grains)
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The presence of mica suggests a source rock of granite or metamorphic origin. Often found in riverbeds, deltas, or desert environments.
Uses & applications
Used primarily in the construction industry as building stone, pavers, or crushed aggregate. High-purity sandstone is used in glass manufacturing.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The sparkling effect seen in this specimen is caused by muscovite or biotite mica reflecting light.
Field identification & locations
Identified by its 'sandpaper' texture and visible mineral grains. To distinguish from similar rocks, check if it scratches glass (quartz content) and look for bedding planes or layers.