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limestone
Limestone is a seimentary rock composed largely of the mineral calcite (calcium carbonate: CaCO3).
Trivia about limestone
Stalactites & stalagmites are formed primarily in caves of this "stone"
Coal dust is very explosive, so mines are sprayed with "dust" from this common calcium-rich sedimentary rock
Fizzing when acid is applied, this mineral is the base of the Portland cement industry
The Center includes 16,000 tons of Italian travertine, a type of this "stone" that also forms marble
You'll find stalactites and stalagmites in caverns made of various types of this sedimentary rock
Dolomitization is the process by which this rock, including its fossils, turns into dolomite
The skeletons of coral polyps are made of calcium carbonate, so coral reefs are mainly this sedimentary rock
The fossils in this type of rock may remain even after it's changed into marble
(Jeff Probst reports from Guatemala.) Mayan pyramids were characteristically constructed with this stone, named for the calcium oxide it produces when burned
(Cheryl of the Clue Crew dissolves a piece of rock in a chemistry experiment.) With diluted hydrochloric acid, you can test for this rock; the acid reacts with the calcite to form CO2
The Rock of Gibraltar is a huge block of this rock made of calcite, a mineral form of calcium carbonate
This rock can be formed by the accumulation of shells or coral, but not from citrus fruit
Nevada's formation-rich Lehman Caves are made of low-grade marble, better known as this
Calcium bicarbonate from this, the most abundant soluble rock, is used by sea creatures in forming shells
In its purest form, this rock used in the cement industry contains only calcite
The Rock of Gibraltar is made up mostly of this rock that's generally composed of calcium carbonate
The Etruscans carved many of their works from tufa, a soft porous variety of this calcium carbonate rock