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