sedimentary
Quartzwacke / Impure Sandstone
Arenite with minor lithic fragments (Silicon Dioxide matrix)
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
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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.
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