sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock
Hardness: 3 on Mohs scale. Color: Light gray to yellowish-white. Luster: Dull to earthy. Crystal structure: Microcrystalline calcite. Cleavage: Perfect rhombohedral in calcite crystals. Specific gravity: 2.7.
- Hardness
- 3 on Mohs scale
- Color
- Light gray to yellowish-white
- Luster
- Dull to earthy
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Physical properties
Hardness: 3 on Mohs scale. Color: Light gray to yellowish-white. Luster: Dull to earthy. Crystal structure: Microcrystalline calcite. Cleavage: Perfect rhombohedral in calcite crystals. Specific gravity: 2.7.
Formation & geological history
Formed from the accumulation and compaction of organic debris such as shell fragments, coral, and skeletal remains in marine environments over millions of years.
Uses & applications
Used in construction, production of lime and cement, aggregate in road building, and as a dimension stone.
Geological facts
Limestone often preserves ancient marine life, acting as a window into prehistoric ocean ecosystems. Many famous architectural monuments, including the Great Pyramids of Giza, are built from limestone.
Field identification & locations
Can be identified in the field by its reaction to dilute hydrochloric acid (effervescence due to calcium carbonate content) and visible fossil fragments. Commonly found in sedimentary basins worldwide.
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