sedimentary
Limestone with Fossil Inclusion
Calcium Carbonate (CaCO3) - Bioclastic Limestone
AI-generated identification · may be incorrectHardness: 3-4 (Mohs); Color: tan, grey, cream; Luster: dull to earthy; Structure: massive with visible bioclasts; Reacts strongly with dilute hydrochloric acid.
- Hardness
- 3-4 (Mohs)
- Color
- tan, grey, cream
- Luster
- dull to earthy
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Physical properties
Hardness: 3-4 (Mohs); Color: tan, grey, cream; Luster: dull to earthy; Structure: massive with visible bioclasts; Reacts strongly with dilute hydrochloric acid.
Formation & geological history
Formed in shallow marine environments from the accumulation of skeletal fragments of marine organisms like coral, forams, and mollusks over millions of years.
Uses & applications
Used extensively in construction (aggregate, cement), architecture (building stone), and as a soil conditioner in agriculture.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth. This specimen shows a circular fossil impression, likely a bivalve or a weathered cephalopod section.
Field identification & locations
Identify in the field by checking for biological patterns or shells and performing an acid fizz test. Commonly found in massive beds across ancient seabed locations.
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