Cyan isn't between green and blue, at least not completely. If you take green and blue, you won't be able to represent a good chunk of cyan hues. It feels greenish and blueish, but is neither, and is broader than any combination of the two, which is partly why some bright cyan objects (like the bird eggs on Wikipedia) look kind of unnaturally intense. Those eggs are a bright, slightly blue-leaning cyan.

BTW, cyan is very poorly represented by sRGB color space. I was delighted to see the real vibrant cyan of the Mediterranean sea.

Yes, for me cyan is firmly a shade of blue, and turquoise is a blue color that's somewhat greenish.

funny thing is that I would have said cyan was blue going into this, but the outcome had me classifying the boundary at "more blue than 93% of the population" -- meaning that I classed cyan as green when asked, without even remotely questioning it.

Same for me, I classify it as blue.