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