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