sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 (on Mohs scale if quartz-rich); Color: Reddish-brown, tan, or terracotta; Luster: Dull to earthy; Crystal structure: Clastic/Granular texture with visible grains; Cleavage: None (it breaks across grains); Specific Gravity: 2.3-2.6.
- Hardness
- 6-7 (on Mohs scale if quartz-rich)
- Color
- Reddish-brown, tan, or terracotta
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (on Mohs scale if quartz-rich); Color: Reddish-brown, tan, or terracotta; Luster: Dull to earthy; Crystal structure: Clastic/Granular texture with visible grains; Cleavage: None (it breaks across grains); Specific Gravity: 2.3-2.6.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color suggests the presence of iron oxide (hematite) during the lithification process. Often formed in ancient deserts, river beds, or beaches.
Uses & applications
Used widely as a building material, paving stone, and in glass manufacturing. Highly valued for architectural decorative elements due to its workability and aesthetic colors. In small, rounded 'river rock' forms, it is used for landscaping.
Geological facts
Red sandstone is a primary component of many famous geological landmarks, such as the Grand Canyon and the 'Red Rocks' of Sedona. It is exceptionally good at preserving footprints and ripple marks from ancient environments.
Field identification & locations
Identify in the field by its gritty, sand-like texture (feels like sandpaper) and visible layering (bedding). It is commonly found in sedimentary basins and along riverbeds where erosion has rounded the specimens. Collectors look for unique banding or fossil inclusions.
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