sedimentary/metamorphic
Sandstone and Quartzite Specimens
SiO2 with varying mineral/clastic inclusions
AI-generated identification · may be incorrectHardness: 6-7 (Mohs); Color: Tan, brown, and off-white; Luster: Dull to vitreous; Structure: Clastic to crystalline; Cleavage: None
- Hardness
- 6-7 (Mohs)
- Color
- Tan, brown, and off-white
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, brown, and off-white; Luster: Dull to vitreous; Structure: Clastic to crystalline; Cleavage: None
Formation & geological history
Formed from the lithification of sand-sized grains (mostly quartz) in marine or continental environments, sometimes undergoing low-grade metamorphism into quartzite.
Uses & applications
Construction aggregate, landscaping, decorative stone, and architectural cladding.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth, while the lighter specimen on the right appears to be a quartz-rich variant or quartzite, which is highly resistant to chemical weathering.
Field identification & locations
Identify in the field by checking grain texture (gritty like sandpaper) and hardness (should scratch glass but not be scratched by a steel nail).
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