BLACK FRIDAY SALE - All T-Shirts $14.95 + Get Free Worldwide Shipping
Nov 28 - Nov 30, 2014: The lowest price we'll have all year - Get yours today!

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 Blackboard chalk used to be made from natural chalk, but it has since been replaced by compressed gypsum (calcium sulfate).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

I want the space that this is now going to take in my mind back. I would like to replace it with my anniversary, which I keep forgetting. Thank you.
Abusive comment hidden. (Show it anyway.)
Commenting is closed.





Check out Twaggies' very funny clip:

Om Nom - Twaggies by Twaggies
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