sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, and cream bands; Luster: Dull/Earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, and cream bands
- 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 on Mohs scale; Color: Tan, brown, and cream bands; Luster: Dull/Earthy; Crystal structure: Granular (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. The banding (Liesegang rings) is caused by the precipitation of iron oxides from groundwater.
Uses & applications
Used primarily in construction (dimension stone), landscaping, decorative carving, and as sandpaper abrasives. High-quality banded specimens are used in lapidary for cabochons and home decor.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The distinct banding seen here is often mistaken for wood grain or fossilized material, but it is actually a chemical precipitation pattern.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layers. It is ubiquitous in arid climates and riverbeds. Collectors should look for unique rhythmic banding patterns.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary