When you put an already-typed crystal into the bulb it should respect you want to crystallize that, and not prevent it from growing just because the bulb has more of a different goo type in it (which is how it selects the initial crystal to make quartz into, but beyond that, it's a bug).

According to Ento this is the current behavior - will try to repro and then fix, presuming it is wrong.

Pretty sure I've got this fixed in the next build.