When something is shaped like a string of beads, such as a beaded chain or an arrangelement of particles, the word moniliform is the perfect word to describe it.  See, for example U.S. Patent No. 7,291,392.

An example of a moniliform arrangement of particles from U..S. Patent No. 7,291,392

In fact when the string of beads configuraion forms long fibers or strands, you might have a moniliform fibriliform configuration, as was described in U.S. Patent No. 6,541,627.