I know there's only one Azure glyph currently available; Air, but it has an almost identical colour scheme to that of the Crystal glyphs (white with blue glow surrounding it). The only difference is a slightly more bluer tint to the whole thing.

(Azure is the 'tornado'-looking one, Crystal is the 'lightning bolt' and 'arrow' looking ones)
(Note: The glyphs are even less distinctively coloured in-game for some reason, at least on my video settings)
But since the actual Way isn't in the glyph description (i.e. when you're buying it), the colour is the only thing we really have to go on, and it seems it could be rather confusing for newbies (I was pretty confused myself)
Now, I noticed that the actual colour of the aura that appears when you cast the spell is purple, which led me to believe that either 'Air' was intended to be of the Crystal Way (which I doubt), or the artist got confuzzled.
Anyway, it makes sense that Azure glyphs should be purple, not white & blue
since
a) Like I said, it's confusing
b) Every other Way has a very distinct colour scheme, except Azure. There's already a blue w/white glow (Blue way) and already white w/ blue glow (Crystal). Bluish white w/blue glow is getting a bit dull
c) The Air glyph, unlike all the other glyphs, does not reflect the casting-aura's colour
at all. (There's not a bit of purple in it)
P.S. Before someone points this out, I
do know what the colour azure actually looks like. It's a very deep, slightly purple blue close to indigo. Personally I don't understand why they would pick
both blue
and azure, but whatever works.
I know it looks nothing like 'purple'. Which is why, I think, it should be Purple Way (Also, because brown is like, the opposite to purple, at least on the EM spectrum, so it makes more sense that White/Black Blue/Red and Purple/Brown are all opposites. (Blue/red isn't an official opposite, but it's usually used more than green)