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