Are there really crystals that emit tachyon energy?

Yes dilithium crystals 

No,

but you may be pleased to learn that there are fairy godmothers who emit fairy dust.

One fairy story is as good as another. I prefer the traditional variety rather than those couched in technobabble.

Oh what a Bary on !!

Nobody has ever tackled a Tachyon

It depends what you are High on !!

Yes.  But you need to be a druggie-brain dead smelly old hippie freak to see it.

Only crystal meth.

No, not at all. 

Tachyon energy is a mathematically probable form 

of energy that has not been verified or discovered yet. 

We have no way of detecting tachyon energy.... if any crystals *do* emit that kind of radiation.... how would we know?

No, tachyon energy has not been observed or verified to exist.

Tachyons are theoretical particles and have never been detected.  The idea that some shameless woopeddlar can sell you a lump of rock that's going to reconnect your chakras, protect you from the evil effects of your mobile phone or whatever is just a load of festering bollocks!

There are crystals which emit Cherenkov Radiation, which is similar in the sense that it's caused by particles exceeding the local speed of light in that medium.  Diamonds for example tend to look bluish because of that.  But tachyons probably don't exist, and if they do, they are unlikely to interact with baryonic matter such as crystals.