This is CiM 801 Marble Ltd Run.
Marble is a translucent milky white in the rod - that looks pretty much like 806 Cirrus - but goes opaque white in the kiln - much like the Lauscha Milky Way.
It really does look like Cirrus when unworked - the lower bead on the left is Cirrus - but it annealed as white. I think it may be stiffer than an opaque white - so there may be some beads that this works better for - if you find that regular whites are losing their shape - i.e. sculptural beads.