sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (primarily CaCO3)
Hardness: 3 on the Mohs scale. Color: Tan, brown, or gray. Luster: Dull to earthy. Crystal structure: Microcrystalline or cryptocrystalline calcite. Cleavage: Perfect rhombohedral in calcite grains. Specific gravity: 2.7.
- Hardness
- 3 on the Mohs scale
- Color
- Tan, brown, or gray
- Luster
- Dull to earthy
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Physical properties
Hardness: 3 on the Mohs scale. Color: Tan, brown, or gray. Luster: Dull to earthy. Crystal structure: Microcrystalline or cryptocrystalline calcite. Cleavage: Perfect rhombohedral in calcite grains. Specific gravity: 2.7.
Formation & geological history
Formed through the accumulation, compaction, and cementation of organic debris such as shell fragments, coral, and skeletal remains in marine environments over millions of years.
Uses & applications
Used in construction, aggregate for concrete, production of lime and cement, and as dimension stone.
Geological facts
Fossiliferous limestone often contains visible fragments of ancient marine life like brachiopods, crinoids, and bryozoans, making it a favorite for amateur fossil hunters.
Field identification & locations
Easily identified by its reaction to dilute hydrochloric acid (fizzing due to calcium carbonate) and the presence of visible fossil imprints or fragments.
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