sedimentary
Limestone (Elephant Skin or Karst-weathered)
Calcium Carbonate (CaCO3)
Hardness: 3-4 (Mohs scale), Color: light grey to creamy white, Luster: dull to earthy, Structure: microcrystalline/biogenic, highly weathered surface texture.
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Physical properties
Hardness: 3-4 (Mohs scale), Color: light grey to creamy white, Luster: dull to earthy, Structure: microcrystalline/biogenic, highly weathered surface texture.
Formation & geological history
Formed from the accumulation of shell, algal, and fecal debris in warm, shallow marine waters. Current appearance is due to dissolution by acidic rainwater (karst process), creating deep rills and ridges.
Uses & applications
Used in the production of cement, as a building stone, in the chemical industry for neutralizing acids, and as decorative rock for landscaping.
Geological facts
This specific texture is often called 'Elephant Skin' by hikers and collectors because it mimics wrinkled hide. Many alpine and river landscapes feature these distinctively eroded limestone blocks.
Field identification & locations
Identify in the field by testing with dilute hydrochloric acid (it will fizz) and looking for the characteristic 'crackled' or weathered surface near water sources or rocky outcrops.
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