This looks like one that would be easy to identify.

Yes, it really is that colour! Entoloma hochstetteri contains three azulene pigments which are responsible for this stunning colour:
This is from a great science/biology news website that is definitely worth a look at:
Mycology MicrobiologyBytes
Azuline is in chamomile flowers too ( the essential oil is blue).
Synthetic azuline is now made, as that from chamomile is so expensive to extract.
Azuline is an anti-inflammatory used sometimes in cosmetics for its soothing effects.