sedimentary
Limestone with Fossil Impression
Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale); Color: Gray to tan; Luster: Dull/Earthy; Structure: Clastic or Biogenic; Cleavage: None visible in hand specimen; Specific Gravity: 2.5-2.7
- Hardness
- 3 (Mohs scale)
- Color
- Gray to tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3 (Mohs scale); Color: Gray to tan; Luster: Dull/Earthy; Structure: Clastic or Biogenic; Cleavage: None visible in hand specimen; Specific Gravity: 2.5-2.7
Formation & geological history
Formed in marine environments from the accumulation of shell, coral, algal, and fecal debris. This specimen shows a weathered surface with a possible interior fossil mold or 'vug' caused by partial dissolution.
Uses & applications
Primarily used as a building material, in the manufacture of cement, and as a soil conditioner. This specific piece has minimal value outside of a personal collection.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth. Acid rain can easily dissolve limestone, leading to the formation of caves and sinkholes.
Field identification & locations
Identify in the field by checking if it fizzes when exposed to a drop of vinegar (acetic acid). Look for it in areas that were once prehistoric seafloors.
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