sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock

AI-generated identification · may be incorrect

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

Identified August 3, 2026More sedimentary →

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Physical properties

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.