80195624 Zebra stone, sedimentary rock from the
80195624 Zebra stone, sedimentary rock from the east Kimberley of Western AustraliaComposed essentially of small particles of quartz and E~sericiteE (fine-grained white mica), zebra rock also contains the minerals kaolinite, dickite and alunite. Known localities of the zebra rock lie close to the Ord River where the rock forms lenses and seams within the Johnny Cake Shale Member of the Ranford Formation, which formed during the late Precambrian (around 670 million years ago).E Some seams of zebra rock are continuous over many kilometres.The colour banding of zebra rock probably formed by the rhythmic precipitation of iron oxide (hematite) rich bands during the alteration of the rock by percolating fluids (fluids migrating through the rock). John Cancalosi All images are copyright protected and remain the property of Ardea Picture Library Ltd. Permission for use is only granted once fee has been agreed and payment made and all digital files must be destroyed unless agreed otherwise in writing. Images must be credited: Photographer Name / ardea.com www.ardea.com webeardea.com
