Sounds like a great inexpensive deal that just doesn't work reliably if at all.
You'll need to stick with products that are actually built for Mac.
This model uses the same sticks as the MacBook Air late 2013. Here's what's available:
They do not have this listed for the MacMini 2014 and I don't know why not, lets see if @danj knows.
If you get the one with the external enclosure it makes transferring data and formatting easy, do not clone as you will not get the repair partition properly installed. Do a clean install then migration assistant.
You can now keep the enclosure with the old stick for a Time Machine User folder backup or sell it on eBay for a profit over what you paid for it (people get them for recovery on original sticks and they are in demand.)