sedimentary
Sandstone Pebble
Arenite (Clastic Sedimentary Rock)
Hardness: 6-7 on Mohs scale; Color: Gray, tan, or light green; Luster: Dull/Earthy; Texture: Granular like sandpaper; Composition: Predominantly quartz grains with mica and feldspar inclusions.
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, tan, or light green
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray, tan, or light green; Luster: Dull/Earthy; Texture: Granular like sandpaper; Composition: Predominantly quartz grains with mica and feldspar inclusions.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years. This specimen shows significant rounding, indicating it was transported and eroded by water in a river or coastal environment.
Uses & applications
Primarily used as construction aggregate, road base, or in landscaping. High-quality sandstone is used for building stone and grindstones.
Geological facts
Sandstone can preserve fossil footprints and ripple marks from ancient environments. It is a highly porous rock, often acting as an important aquifer for groundwater or a reservoir for petroleum.
Field identification & locations
Identify in the field by its gritty texture and visible sand grains. It is very common in riverbeds, beaches, and desert outcrops globally. Collectors look for unique banding or fossil inclusions.
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