Temporarily strung (claspless) There are about 45 beads on an 8mm strand. "Moss opal is a milky white to brownish opal with dark greenish inclusions that resemble moss. Moss opal may also be referred to as "dendritic opal" because of the tree-like appearance of the inclusions, or "dendrites," which comes from the Greek word, "dendron" meaning "tree."