sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
Hardness: 6-7 (on Mohs scale if quartz-rich); Color: Tan, beige, grey, and yellow with visible metallic grains (likely pyrite); Luster: Dull/Earthy with vitreous sparkles; Crystal structure: Clastic (granular); Cleavage: None.
- Hardness
- 6-7 (on Mohs scale if quartz-rich)
- Luster
- Dull/Earthy with vitreous sparkles
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Physical properties
Hardness: 6-7 (on Mohs scale if quartz-rich); Color: Tan, beige, grey, and yellow with visible metallic grains (likely pyrite); Luster: Dull/Earthy with vitreous sparkles; Crystal structure: Clastic (granular); Cleavage: None.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in river beds, beaches, or desert environments.
Uses & applications
Used widely in construction as a building material, decorative stone, and in the manufacturing of glass and grindstones.
Geological facts
Sandstone can be a significant reservoir for groundwater, oil, and natural gas due to its porosity. The presence of yellow/gold specks in this specimen suggests mineralization, possibly pyrite ('Fool's Gold').
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel and visible grains. Often found in riverbeds or near coastal cliffs. Look for layering (bedding) or cross-bedding features.
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