sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock / CaCO3 with fossil fragments
Hardness of 3 on the Mohs scale, typically gray, tan, or buff in color, dull to earthy luster, compact crystal structure consisting of microcrystalline calcite, specific gravity around 2.7.
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Physical properties
Hardness of 3 on the Mohs scale, typically gray, tan, or buff in color, dull to earthy luster, compact crystal structure consisting of microcrystalline calcite, specific gravity around 2.7.
Formation & geological history
Formed through the accumulation and lithification of organic debris such as shells, coral, algal, and other skeletal fragments in marine environments over millions of years.
Uses & applications
Used in construction, as a building stone, in the manufacture of lime and cement, and prized by fossil collectors and educators.
Geological facts
Many famous historical buildings and monuments, such as the Great Pyramid of Giza and parts of the Empire State Building, incorporate limestone containing visible fossils.
Field identification & locations
Can be identified in the field by its reaction to dilute hydrochloric acid (effervescence) and the presence of visible fossil impressions or shell fragments embedded in the matrix.
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