black chalk
A slaty bluish mineral, a variety of argillaceous slate, used for drawing and for…A slaty bluish mineral, a variety of argillaceous slate, used for drawing and for making black paint.
Meaning
1 senses(uncountable)A slaty bluish mineral, a variety of argillaceous slate, used for drawing and for making black paint.
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable