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