Amazonite. This is very richly coloured and very fine grained, excellent quality from older stock. Breathtaking!
These strands come with a knot between each bead, which prevents them from rubbing, but also makes unstringing them tedious. However, you could just slap a clamshell tip on each end, add a clasp and a chain extender, and call it done.
6mm x 8mm Approx. 46 on 16 inch (40.64 cm) strand. (strand)