sedimentary
Sandstone with Tafoni Weathering
Arenite (SiO2 based)
Hardness: 6-7 (Mohs scale); Color: Tan, beige, gray; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, beige, gray
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, beige, gray; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments of sand size. The honeycomb-like 'Tafoni' patterns are formed by cavernous weathering, typically involving salt crystallization, wind, and differential erosion in coastal or arid environments.
Uses & applications
Used primarily as a construction material (dimension stone), road base, and in glass manufacturing if the quartz content is high.
Geological facts
The intricate 'Swiss cheese' appearance is known as tafoni. These structures are common in coastal sandstone cliffs and can range from tiny pits to large caverns over thousands of years.
Field identification & locations
Identify in the field by its gritty texture and visible sand grains. It is often found in stratified layers near oceans or ancient desert basins. Look for characteristic cavernous weathering pits.
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