fossil
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
Hardness: 3 on Mohs scale (matrix); Color: Tan, brownish-pink, grey, yellowish-brown; Luster: Dull, earthy; Texture: Porous, granular to bioclastic structure
- Hardness
- 3 on Mohs scale (matrix)
- Color
- Tan, brownish-pink, grey, yellowish-brown
- Luster
- Dull, earthy
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Physical properties
Hardness: 3 on Mohs scale (matrix); Color: Tan, brownish-pink, grey, yellowish-brown; Luster: Dull, earthy; Texture: Porous, granular to bioclastic structure
Formation & geological history
Formed in warm, shallow marine or freshwater environments by the accumulation and cementation of organic remains such as shell fragments, coral, or crinoids alongside calcium carbonate sediment over millions of years.
Uses & applications
Used primarily for fossil collecting, educational study, local building material, and crushed stone aggregate.
Geological facts
Fossiliferous limestones often preserve snapshot ecosystems from periods like the Paleozoic or Mesozoic eras. The small pitted or porous structures seen in the lower matrix represent shell molds or dissolved organic matter.
Field identification & locations
Identified by its effervescence (fizzing) when exposed to dilute hydrochloric acid, earthy texture, soft matrix compared to quartz, and visible inclusions of fossilized shell or skeletal fragments. Widely found in sedimentary rock formations around former sea beds.
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