Rare Australian Zebra stone + purple leather cording + brass wire = Mamba on Three. I totally thought about Kobe Bryant making this & I should probably keep it.. But... It will find its right home. (No clasp, slips over head) Length = 24 inches. This distinctive reddish-brown and white-banded sedimentary rock from the east Kimberley of Western Australia is called 'zebra rock' or 'zebra stone'. Composed essentially of small particles of quartz and 'sericite' (fine-grained white mica), zebra rock also contains the minerals kaolinite, dickite and alunite.