sedimentary

Quartzwacke / Impure Sandstone

Arenite with minor lithic fragments (Silicon Dioxide matrix)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: light grey to off-white; Luster: dull to vitreous; Crystal structure: granular clastic texture; Cleavage: none; Specific gravity: approx. 2.6.

Hardness: 6-7 on Mohs scale
Color: light grey to off-white
Luster: dull to vitreous

Identified June 2, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: light grey to off-white; Luster: dull to vitreous; Crystal structure: granular clastic texture; Cleavage: none; Specific gravity: approx. 2.6.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in river, lake, or ocean environments and lithified over millions of years.

Uses & applications

Commonly used as construction aggregate, road base material, or in the manufacturing of glass if high in silica purity.

Geological facts

Sandstone makes up about 10-20% of all sedimentary rocks on Earth. It often preserves fossils and ripple marks from ancient water currents.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Found globally in sedimentary basins. Collectors often look for colorful banding or mineral inclusions.