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