Fossiliferous Limestone
What is Fossiliferous Limestone?
Fossiliferous limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO3) in the form of the mineral calcite. It is characterized by the presence of visible fossils, which are the preserved remains or traces of ancient organisms. The fossils can include shells, bones, teeth, and other skeletal fragments of marine animals, as well as plant remains. The rock's appearance varies depending on the types and abundance of fossils, the grain size of the calcite, and the presence of other minerals. It is formed through the accumulation and lithification of the skeletal remains of marine organisms, often in shallow marine environments.
Optical Properties
- Refractive Index
- 1.486 - 1.658
- Birefringence
- Moderate
- Pleochroism
- Absent
- Optical Character
- Uniaxial negative
- Dispersion
- Moderate
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Fossiliferous Limestone before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Fossiliferous Limestone Localities Map
See where Fossiliferous Limestone is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Typically light gray, tan, or buff, but can vary depending on impurities and fossil content.
- Hardness (Mohs)
- 3
- Density
- 2.6 - 2.8 g/cm³
- Streak
- White
- Luster
- Vitreous to dull
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- CaCO3
- Elements
- Calcium, Carbon, Oxygen, and trace elements like Magnesium, Iron, and Silicon
Also Known As
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Fossiliferous Limestone FAQs
How do I identify Fossiliferous Limestone?
Fossiliferous Limestone can be identified by its hardness of 3 on the Mohs scale, Typically light gray color, Vitreous to dull luster, Trigonal crystal system. Look for these key characteristics when examining specimens.
What color is Fossiliferous Limestone?
Fossiliferous Limestone typically appears in Typically light gray, tan, or buff, but can vary depending on impurities and fossil content.. Color can vary depending on impurities and formation conditions.
How hard is Fossiliferous Limestone?
Fossiliferous Limestone has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.