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