In India, an impure concretionary carbonate of lime, usually occurring in nodules, in alluvial deposits, and especially in the older of these formations.(noun)
The Century Dictionary (Public Domain)
Use "kankar" in a sentence
"Limestones, called "kankar" in India, that contain 5 to 25 % of clay can produce a hydraulic lime, which hardens in the presence of water, like a cement."
"Although many suitable calcareous materials, such as chalk, marl, sea shale, kankar etc. can fulfil the requirements for cement manufacture, limestone serves as the principal source of the calcareous base, due to its vast availability compared with the other resources."
"In the cottage sector, kankar, a time-tested impure limestone is used to produce lime of reasonable quality."