You can find a variety of colors depending on the exact stone used, including those made from granite, marble, and slate ...
No matter where it's from, all slate is a type of natural stone (or, more precisely, metamorphic rock) dug up from the ...
Because of this, it is used to make floor tiles and wall tiles ... making chalk sticks to write on blackboards. Other rocks, such as slate, do not let water soak through them.