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