Sounds like a lot of crystals; a lot more than four in Mudd's Women and the Alternative Factor. Or one in Elaan of Troyius.
That's why I said
up to six crystals in the body of the ship, solely to account for the fact that Kirk asked the miners for 6 in
Mudd's Women. I'm certainly open to the fact that he just wanted a couple of spares (given how easily those natural crystals fracture!) and that the usual compliment of (di)lithium crystal circuits is 4
Then there's the dialogue in TTI:
SCOTT: No casualties, Captain, but trouble aplenty with the engines. Every dilithium crystal connection's smashed in the warp engine circuitry. We're trying to bypass them now.
This sounds very much like the type of engine/power troubles that would crop up in TOS from time to time, right down to the option of bypassing the affected systems.
KIRK: What about main circuits?
SCOTT: Well, you have to see it to believe it, sir. Those big crystals in there have come apart. Each of them unpeeling like the rind of an orange.
Here Kirk is clearly talking about a completely different piece of equipment. And apparently different crystals too, since Scotty makes the distinction of referring to their size.
