1) Karst formation 
A speleothem (m; Greek: `cave deposit`), commonly known as a cave formation, is a secondary mineral deposit formed in a cave. Speleothems are typically formed in limestone or dolostone solutional caves. ==Origin and composition== While more than 250 cave mineral deposits exist, the vast majority of speleothems are calcerous, composed of calcium .....
structure in a cave formed by deposition of minerals in water
A cave feature (decoration) formed by the chemical deposition of secondary minerals, most commonly calcite (CaCO3).
A mineral deposit of calcium carbonate that precipitates from solution in a cave.
speleothem 1. Mineral deposits that form in a cave after the creation of the cave itself. 2. A secondary mineral deposited in a cave by the action of water; cave formation. These deposits are generally composed of calcium carbonate dissolved from the surrounding limestone by groundwater. Carbon dioxide carried in the water is released as the water...
overall term for cave deposits of chemical origin.