A substance usually made from calcium carbonate used for writing or drawing on surfaces like blackboards.

A soft white mineral used in some geological formations.

चूना पत्थर

English Usage: The chalk formation in the cliffs was fascinating to geologists.

Hindi Usage: चट्टानों में चूना पत्थर का गठन भूविज्ञानियों के लिए आकर्षक था।