sedimentary

Sandstone (Micaceous)

Clastic Sedimentary Rock (primarily SiO2 with Mica)

AI-generated identification · may be incorrect

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

Identified May 24, 2026More sedimentary →

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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.