The Chinese word for chalk is
粉笔

fěn bǐ

Chinese Definition

chalk
1. 粉笔;上白垩纪;白垩
Components
粉
1. powder
麵粉是小麥做的粉。 - Flour is a powder made from wheat.
2. face powder
3. 粉墨登場 - to go on the stage
4. flour
5. (Cantonese, slang) heroin
粉碎 - to smash
粉身--碎骨 - to have one's body smashed to pieces
6. (color)
7. pink
8. 我把頭髮染成了粉的。 - I dyed my hair pink.
9. white
10. 粉壁 - white wall
11. 粉飾 - to whitewash
12. (dialectal) to whitewash
13. (food)
14. food made from starch or flour (noodles, vermicelli, etc.)
15. 粉條 - Chinese vermicelli
16. 涼粉 - grass jelly
17. 河粉 - he fen noodles
18. bean or sweet potato noodles
19. =====Usage notes=====
20. fan; fanatic
^明粉 - fan of the Ming dynasty
川粉 - fan of Donald Trump
米粉 - fan of Xiaomi
21. (Internet, neologism, slang) follower on a social media platform; subscriber
22. to be a fan of (a person, a group, etc.); to admire
笔
1. Variant of 筆

白堊
1. n. chalk (the stone)

粉筆
1. n. chalk (the writing implement)
他給了我一枝粉筆，讓我在黑板上寫下自己的名字。 - He gave me a piece of chalk and asked me to write my name on the blackboard.