What's the plural form of greyschist? Here's the word you're looking for.
Answer
The noun greyschist can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be greyschist.
However, in more specific contexts, the plural form can also be greyschists e.g. in reference to various types of greyschists
or a collection of greyschists.
