sedimentary
Fossiliferous Limestone
CaCO3 (with biological inclusions)
Hardness: 3-4 (Mohs); Color: Gray to tan; Luster: Dull/Earthy; Structure: Clastic or Bioclastic; Cleavage: None/Irregular break; Reacts with acid.
- Hardness
- 3-4 (Mohs)
- Color
- Gray to tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3-4 (Mohs); Color: Gray to tan; Luster: Dull/Earthy; Structure: Clastic or Bioclastic; Cleavage: None/Irregular break; Reacts with acid.
Formation & geological history
Formed in warm, shallow marine environments through the accumulation of shell, coral, algal, and fecal debris over millions of years.
Uses & applications
Used in construction, as road base, in the production of cement, and for soil conditioning in agriculture. If high in fossils, used as decorative stone.
Geological facts
This specimen contains visible fossil impressions or fragments, likely from ancient marine organisms such as crinoids or mollusks. Limestone covers about 10% of the total surface area of all sedimentary rocks.
Field identification & locations
Identify by a grayish color, earthy texture, and a positive fizz test with household vinegar. Found in fossil-rich sedimentary basins worldwide.
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