Trivia: Blackboard Chalk Isn't Made of Chalk

Blackboard chalk is made of gypsum, not chalk.

Chalk is a type of limestone composed of the mineral calcite. Blackboard chalk used to be made from natural chalk, but it has since been replaced by compressed gypsum (calcium sulfate).


Newest 4
Newest 4 Comments

Login to comment.




Email This Post to a Friend
"Trivia: Blackboard Chalk Isn't Made of Chalk"

Separate multiple emails with a comma. Limit 5.

 

Success! Your email has been sent!

close window
X

This website uses cookies.

This website uses cookies to improve user experience. By using this website you consent to all cookies in accordance with our Privacy Policy.

I agree
 
Learn More