sedimentary
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
Hardness: 6-7 Mohs; Color: Brownish-tan with visible crystalline grains; Luster: Dull to vitreous on grain faces; Structure: Granular/Clastic; Cleavage: None (conchoidal fracture through grains).
- Hardness
- 6-7 Mohs
- Color
- Brownish-tan with visible crystalline grains
- Luster
- Dull to vitreous on grain faces
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Physical properties
Hardness: 6-7 Mohs; Color: Brownish-tan with visible crystalline grains; Luster: Dull to vitreous on grain faces; Structure: Granular/Clastic; Cleavage: None (conchoidal fracture through grains).
Formation & geological history
Formed through the accumulation and cementation of mineral particles (sand) over millions of years, typically in river beds or coastal environments. This specimen shows high compaction, potentially bordering on low-grade metamorphism (quartzite).
Uses & applications
Used primarily in construction as an aggregate, building stone, and historically for grindstones. In crushed form, high-silica sandstone is used in glass making.
Geological facts
Sandstone accounts for approximately 20% of all sedimentary rocks on Earth. The sparkly appearance in this specimen comes from light reflecting off the flat crystal faces of individual quartz grains.
Field identification & locations
Identify in the field by its 'sandpaper' texture. It is found globally across all continents. Collectors look for specific patterns or fossils, though this specimen is a common bulk variety.
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