sedimentary
Flagstone (Sandstone)
Clastic Sedimentary Rock (composed of quartz and feldspar)
Hardness: 6-7 (Mohs scale); Color: Tan, brown, reddish-orange; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None (splits along bedding planes); Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, reddish-orange
- Luster
- Dull/Earthy
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, reddish-orange; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None (splits along bedding planes); Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years in marine or desert environments. This specimen shows flat bedding planes typical of sedimentary deposits.
Uses & applications
Primarily used in construction for paving, walkways, patios, fences, and roofing. Also used as decorative veneer for walls and fireplaces.
Geological facts
Flagstone is a generic term for any flat stone used for paving; while usually sandstone, it can also be slate or quartzite. The color variations are often caused by iron oxides (rust).
Field identification & locations
Identify in the field by its distinct layering (stratification) and sand-like texture. It feels gritty to the touch and often breaks into flat sheets. Common in arid regions and river basins.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary