Johnny Cake Shale Formation, East Kimberly, Western Australia, Australia Found only in the Johnny Cake Shale formation of Western Australia, this reddish-brown and white banded clay based rock is known as "Zebrastone". While the reddish-brown color can be attributed to the presence of iron oxides, the origin of its unique pattern of stripes and dots has yet to be explained by geologists and is still considered to be a mineralogical mystery. The present large sphere displays the distinctive pattern for which this mineral is known, culminating in a whimsical feature to one end: giving the appearance of the eyes, nose and mouth of a koala bear. The distinct pattern is revealed by expert polishing which has produced a porcellaneous finish. Diameter 7 in
Johnny Cake Shale Formation, East Kimberly, Western Australia, Australia Found only in the Johnny Cake Shale formation of Western Australia, this reddish-brown and white banded clay based rock is known as "Zebrastone". While the reddish-brown color can be attributed to the presence of iron oxides, the origin of its unique pattern of stripes and dots has yet to be explained by geologists and is still considered to be a mineralogical mystery. The present large sphere displays the distinctive pattern for which this mineral is known, culminating in a whimsical feature to one end: giving the appearance of the eyes, nose and mouth of a koala bear. The distinct pattern is revealed by expert polishing which has produced a porcellaneous finish. Diameter 7 in
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
