sedimentary
Sandstone (with Arkose characteristics)
Clastic sedimentary rock (SiO2 with KAlSi3O8)
Hardness: 6-7 (Mohs); Color: Tan, beige with reddish-orange patches; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Tan, beige with reddish-orange patches
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, beige with reddish-orange patches; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formation through the accumulation and cementation of mineral particles (sand-sized grains) such as quartz and feldspar, often in riverbeds, deserts, or coastal environments. Often dates from various eras depending on the local strata.
Uses & applications
Used widely in construction as a building material, in the glass industry (if high silica), and for decorative architectural features.
Geological facts
Sandstone accounts for about 20% of all sedimentary rocks on Earth. The red patches often indicate the presence of iron oxide (hematite).
Field identification & locations
Identify by its gritty, sand-like texture when touched. Found globally in basins and mountainous regions. Collectors look for unique banding or fossil inclusions.
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