It's called Aqua. My 'recipe' is 44% green corriedale, 44% blue corriedale and 12% natural white. Also traces of cheesecake and lavender. The blue, green and white are well-blended with the yellow and purple added later in the process.
At first the blue and green appear as separate colours, but on the second or third pass they start to mix together, so even when you look closely you see a lovely turquoise colour rather than separate blue and green. There's still some separation after three passes, and the knitted yarn will still have a slightly heathered look but I don't see any point carding further than this because the colours will start to go 'flat' and you may save yourself the hard work and buy spearmint corriedale.