sedimentary

Sandstone (likely Graywacke or Arkose)

Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Gray, tan, or brownish; Luster: Dull/Earthy; Texture: Granular, medium-grained; Cleavage: None, breaks across grains; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Gray, tan, or brownish
Luster: Dull/Earthy

Identified June 27, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Gray, tan, or brownish; Luster: Dull/Earthy; Texture: Granular, medium-grained; Cleavage: None, breaks across grains; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in riverbeds, lakes, or ocean basins over millions of years (ranging from Paleozoic to recent).

Uses & applications

Used widely in construction as a building material, road base, or decorative stone. Sometimes used in glass manufacturing if the quartz content is high enough.

Geological facts

Sandstones make up roughly 20 percent of all sedimentary rocks on Earth. They are often excellent aquifers, meaning they can store large amounts of groundwater or petroleum in their pore spaces.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel. It is commonly found in desert environments, old river beds, and coastal areas. Collectors look for unique weathering patterns or fossil inclusions.