sedimentary
Heart-shaped Limestone
Calcium Carbonate (CaCO3)
Hardness of 3 on the Mohs scale, typically off-white to gray in color, dull to earthy luster, fine-grained to microcrystalline structure, poor to distinct cleavage, specific gravity of 2.71.
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Physical properties
Hardness of 3 on the Mohs scale, typically off-white to gray in color, dull to earthy luster, fine-grained to microcrystalline structure, poor to distinct cleavage, specific gravity of 2.71.
Formation & geological history
Formed by the accumulation and lithification of organic debris such as shells, coral, and algal remains in shallow marine environments over millions of years.
Uses & applications
Used primarily in construction, as aggregate in concrete, manufacturing of cement, agriculture, and as novelty specimens or decorative items when naturally shaped.
Geological facts
Naturally occurring heart-shaped stones are formed through differential weathering and erosion, where softer parts of the rock erode faster than harder sections, leaving behind a heart shape.
Field identification & locations
Found worldwide in sedimentary rock formations, particularly in areas with ancient seabeds. Easily identified by its reaction with dilute hydrochloric acid (effervescence) and its relatively soft nature.
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