sedimentary
Sandstone
Sedimentary Rock (Quartz/Feldspar grains cemented together)
Hardness: 6-7 on the Mohs scale depending on cementation; Color: Reddish-brown due to iron oxide; Luster: Dull to earthy; Crystal structure: Clastic texture with rounded or angular mineral grains; Specific gravity: 2.2-2.8
- Hardness
- 6-7 on the Mohs scale depending on cementation
- Color
- Reddish-brown due to iron oxide
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on the Mohs scale depending on cementation; Color: Reddish-brown due to iron oxide; Luster: Dull to earthy; Crystal structure: Clastic texture with rounded or angular mineral grains; Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz, in environments such as deserts, rivers, and beaches over millions of years.
Uses & applications
Used extensively in construction as dimension stone, building material, paving, and formerly for grindstones.
Geological facts
Many of the world's tallest and most visually striking desert rock formations, such as those in Zion or the Grand Canyon, are composed of massive layers of ancient sandstone.
Field identification & locations
Identified by its sandy texture, visible grains, and gritty feel. Common worldwide in sedimentary basins, riverbeds, and arid regions.
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