So i recently moved across the country. I dont know anybody here, dont have any heroin connects so i went looking for some last night, stopped at a gas station in a not so safe part of town this black guy called me over asking me if i needed anything i told him heroin he claimed he got some super fire china white. im from seattle so im used to black tar never came across chine in my life he pulls out a little half rock half powder white brick it looked legit to me so i bought it tossed it on some foil started smoking it nods me out for 3 seconds then it turns into a mild meth feeling high sudden energy tweeking i thought it might be crystal but it doesnt look like it at all and its gives me a slight nod right after a hit. what could it bro?? i looked online a little maybe its fentanyl tanks for the help!