sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 Mohs; Color: Tan, brown, or gold; Luster: Dull to vitreous (sparkly quartz grains); Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2–2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, brown, or gold
- Luster
- Dull to vitreous (sparkly quartz grains)
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, brown, or gold; Luster: Dull to vitreous (sparkly quartz grains); Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2–2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains, typically quartz. This specimen appears weathered and may have undergone low-grade heat/pressure transitions toward quartzite.
Uses & applications
Used widely in construction as a building material, paving stones, and in the manufacturing of glass and abrasives.
Geological facts
Sandstone accounts for approximately 20% of all sedimentary rocks on Earth and is the primary reservoir for both groundwater and petroleum in many geographical regions.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible quartz grains. Often found in ancient riverbeds, deserts, or coastal beach deposits.
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