sedimentary
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (Mohs scale); Color: Pale greyish-green; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Pale greyish-green
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Pale greyish-green; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
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 water-worn redondeing, likely from a river or beach environment.
Uses & applications
Commonly used in construction, as a building stone (freestone), and sometimes as a source of silica for glass making. In this small, rounded form, it is primarily a decorative or pocket stone.
Geological facts
Sandstone accounts for roughly 20% of all sedimentary rocks on Earth. The 'greenish' tint in some specimens can be caused by the presence of minerals like glauconite or chlorite.
Field identification & locations
Identify in the field by its gritty, sandpaper-like texture and visible sand grains. It is commonly found in sedimentary basins and along riverbeds. For collectors, look for cross-bedding or fossils within larger blocks.
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