I bought some random tea recently from the local Asian market
This is Huangjingui, a variety of oolong that is often used to imitate tieguanyin. They don’t quite taste the same, and tieguanyin (real ones anyway) are better, but if you don’t know much about this stuff… you might just think this is tieguanyin.
It’s certainly hard to tell by looks
The tea is thinner, and this particular one is slightly sour. The taste is a bit different from tieguanyin, and that, I think, is the biggest marker of difference, but taste is a fickle thing, and as we all know, taste is relative and subjective. It can easily be sold at some “gourmet” tea shop as some “jade oolong” and cost you $10 per 50g.
It’s not the greatest tea… but probably worth the $3 I paid for it.