Mangosteen Twins

[Doglips]

I just uppotted my mangosteen seedlings.  One of them had two seedlings in one pot.  Long story short, I could have put two seeds in a pot.  During the up-pot I separated the two seedlings and found that they were twins from the same seed.  They are quite a bit smaller than the biggest seedling from the same batch (but bigger than the runts).
Is twinning at all common in mangosteens?
Since this is a mangosteen, does that mean that they can only be clones?

[davidgarcia899]

I can't say for Mangosteen seeds. But this doesnt seem to be a very rare occurrence for Garcinia, I've seen a couple