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