General chalk:
* शुक्ला (Shukla): This literally means "white" and is often used to refer to chalk.
* खड़िया (Khadiya): This is a more specific term for a type of white clay often used as chalk.
For writing on a blackboard:
* श्यामापट्टलेखनी (Shyamapatta-lekhani): This is a more descriptive term meaning "blackboard writing tool."
For drawing or painting:
* चित्रलेखनी (Chitra-lekhani): This means "drawing tool" and could be used for chalk used in art.
The best term to use would depend on the context and the specific type of chalk you're referring to.