I think it's all rock. So sand, mineral sand (salt and diamonds), metal sand, seashell is calcium sand so that would mean grounded bone would count and that would mean yes, in enough quantities and processed, bladder stone sand.
In yeast and and cocaine standpoint I think they are in more of...
I bet couple of heads has been hit with them once or twice in history. It's not like they explode from impact. Twist open a cap from pommel, see a pullcord with a ball, pull, and throw. Cord is like a granade pin. Timer does the rest.