I bought this 70W 6500K aquarium MH lamp for my tracklight at Aliexpress, for research purposes related to white high pressure indium iodide lamps.
Would this lamp contain an indium iodide really, and not different halide chemistry or in the worst case argon + mercury only?
Would this lamp have a UV stop quartz outer jacket and not fused quartz outer jacket?
Would it be dangerous?

The outer is with all these formats made of fused quartz, but the quartz is supposed to be doped to block the UV for general lighting lamps.
But here I have two doubts:
1) It is a lamp of questionable origin, so it could be made without that doping, so emitting dangerous UV
2) Some aquarium lamps are designed on purpose to emit UV, to maintain the water cleanness (mimicking the direct sun), so still the UV could be too much for use as general lighting.

So better make sure the cover glass blocks any UV...

You're paying enough that it's likely a decent lamp.

I bought a $5 6500k "metal halide" aquarium lamp online once whose spectrum was indistinguishable from a mercury vapor lamp.