What yarn is this?

Can any of you ladies in the U.S help? I have a pattern from Chicks with Sticks which uses a yarn called Artful Yarns Heavenly Mohair [could’nt find it on Yarndex] it is described as light chunky. I am in the U.K how does that convert to our yarns? Would it be say a heavy worsted? The pattern I want to do is the crocheted purple haze fingerless gloves:think:

Here ya go:

http://www.calyarn.com/colorcardpages/artfulheavenly-cc.htm

Thank you for that Labeelady, that’s a big help