Mohair, apart from kid mohair normally needs some wool to hold the yarn together. We mostly use Corriedale or occasionally Blue-faced Leicester for this.
At present we have blends with Manx, Jacob and Hebridean wool, which are particularly suitable for socks in the 4-ply weights and good for everything in DK!
Mohair gives yarn the natural lustrous white of the angora goat, which also takes dye beautifully, as you can see ...