sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (containing bioclasts)
Hardness: 3-4 (Mohs scale); Color: Tan, brown, and grey; Luster: Dull/Earthy; Structure: Contains visible marine fossils (likely crinoid stems or shell fragments); Composition: Primarily Calcium Carbonate (CaCO3).
- Hardness
- 3-4 (Mohs scale)
- Color
- Tan, brown, and grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3-4 (Mohs scale); Color: Tan, brown, and grey; Luster: Dull/Earthy; Structure: Contains visible marine fossils (likely crinoid stems or shell fragments); Composition: Primarily Calcium Carbonate (CaCO3).
Formation & geological history
Formed in shallow marine environments over millions of years through the accumulation and lithification of organic debris such as shell fragments and coral.
Uses & applications
Used in construction as building stone, cement manufacture, and gravel. Purely decorative specimens are kept by enthusiasts and used in educational settings.
Geological facts
Limestone covers about 10% of the total surface area of all sedimentary rocks on Earth. This specific specimen shows high fossil density, indicating a rich ancient marine ecosystem.
Field identification & locations
Identify by looking for visible shell or organism remnants; it will react (fizz) when exposed to a weak acid like vinegar. Commonly found in areas that were once prehistoric seafloors.
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