The semiconductor industry calls the cuts of a crystal die or dice. Is this term outside of semiconducting industries correct too?
For example, a crystal has been cut into small plates. What are the plates called then?
In this context, the term "die" really only applies to the semiconductor industry. Depending on the industry, the terms "slice" or "sheet" might be better suited.
In your example of crystals, if you are specifically referring to piezoelectric crystals of the variety used in the semiconductor industry, the process involves dicing quartz plates in to what are known as "blanks", the blanks are then lapped and further processed before grading and finishing up as what's called a "quartz oscillator-plate" or "piezoid".