Like thaline blue this is a phthalocyanine green with a touch of zinc white. It is a warmish green blue.
Phthalo green was introduced in 1938 and is a synthetic organic from the group of phthalocyanine dyes. Previous to its introduction, the only greens capable of equal brilliance were the original Emerald Greens which were opaque, more limited in their mixtures, harmful and much less permanent.
I think this stands out due to it's warm edge which is really different, it also comes from the family of pigments with crazy tint strength, combine that with joyous texture and you have a super tube of paint.
Pigment PW4 & PG7
Opaque, high tint strength, medium drying, poppyseed oil.