sedimentary
Limestone with Fossil inclusions
Fossiliferous Limestone (CaCO3)
Hardness: 3 on Mohs scale; Color: Grey with tan weathering; Luster: Dull/Earthy; Structure: Clastic or Biogenic; Cleavage: None (rhombohedral in calcite crystals), reacts with HCl acid.
- Hardness
- 3 on Mohs scale
- Color
- Grey with tan weathering
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3 on Mohs scale; Color: Grey with tan weathering; Luster: Dull/Earthy; Structure: Clastic or Biogenic; Cleavage: None (rhombohedral in calcite crystals), reacts with HCl acid.
Formation & geological history
Formed in shallow marine environments from the accumulation of calcium carbonate and organic debris including shells, corals, and algae; typically Paleozoic to Cenozoic era.
Uses & applications
Crushed stone for road construction, lime for concrete, building facade material, and as an educational specimen for paleontology.
Geological facts
This specimen contains dark, rod-like impressions likely representing crinoid stems or small shell fragments. Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth.
Field identification & locations
Identify by its grey color, presence of visible fossil remains, and the 'fizz' test using vinegar or weak acid. Common in riverbeds and mountainous outcrops of former sea floors.
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