Limestone is of rather low value, but nevertheless it is probably the most important mineral. It is mined and used in large amounts, which often conflicts with the protection of karst areas and caves.
In history man used first the flint nodules, which are common in limestone. Later, after he became resident he used the rock for building purposes. Various kinds of limestone and marble were used for walls, pillars and much more. The soft rock was used to produce sculptures. Even limestone roofs and floors were built.
With the increase of technology many more usages of limestone were found. It is burnt in kilns to produce lime, white wall color, and finally cement for concrete. It is needed to produce glass, porcelain, or as addition in the melting of many metals. It is used to purify coal and the waste gas of power plants using carbon based fuel. Limestone neutralizes many toxic substances, especially sulfur oxide and sulfur dioxide. In combination with sulfur it is converted into gypsum.
Limestone is typically quarried, as it occurs in huge sedimentary layers, and as mining is to expensive.
 Grotten Van Kanne, Belgium
Grotten Van Kanne, Belgium Velká Amerika, Czech Republic
Velká Amerika, Czech Republic Solvayovy Lomy, Czech Republic
Solvayovy Lomy, Czech Republic Felsendome Rabenstein, Germany
Felsendome Rabenstein, Germany Tytyri Gruvmuseum, Finland
Tytyri Gruvmuseum, Finland Carrières de la Lie, France
Carrières de la Lie, France Le Troglo des Pommes Tapees, France
Le Troglo des Pommes Tapees, France Champignonnière du Saut-aux-Loups, France
Champignonnière du Saut-aux-Loups, France Fertőrákosi Barlangszínház, Hungary
Fertőrákosi Barlangszínház, Hungary King Solomon’s Quarries, Israel
King Solomon’s Quarries, Israel Cava 177, Italy
Cava 177, Italy Cava del Piastraio, Italy
Cava del Piastraio, Italy Galleria Ravaccione, Italy
Galleria Ravaccione, Italy La Fornace di Barbablù, Italy
La Fornace di Barbablù, Italy Duivelsgrot, Netherlands
Duivelsgrot, Netherlands Dalen-Kjørholt Gruve, Norway
Dalen-Kjørholt Gruve, Norway NOAH Langøya, Norway
NOAH Langøya, Norway Daugbjerg Kalkgruber, Denmark
Daugbjerg Kalkgruber, Denmark Mønsted Kalkgruber, Denmark
Mønsted Kalkgruber, Denmark Tykarpsgrottan, Sweden
Tykarpsgrottan, Sweden Odessa Catacombs, Ukraine
Odessa Catacombs, Ukraine Elliott Underground Quarry, United States of America
Elliott Underground Quarry, United States of America Rolla Experimental Mine, United States of America
Rolla Experimental Mine, United States of America Louisville Mega Cavern, United States of America
Louisville Mega Cavern, United States of America Mines & Meadows ATV Riding Resort, United States of America
Mines & Meadows ATV Riding Resort, United States of America SubTropolis, United States of America
SubTropolis, United States of America