From Wikimedia Commons, the free media repository
English: Sticks of processed chalk are produced especially for use with chalkboards in white and also in various colours. These are not actually made from chalk rock but from calcium sulfate in its dihydrate form, gypsum.
Media in category "Chalk sticks"
The following 17 files are in this category, out of 17 total.
- Chalk sticks. Made in...
- Congregating Chalk.JPG
- Doosje krijtjes.JPG
- DSC 6623-MR-Craies.jpg
- Heiwa elementary schoo...
- Lone Chalk Stick.JPG
- Multicoloured chalk.jpg
- Sidewalk chalk in scho...