The unique Zebra Stone has been placed at 600 million years in the Upper Proterozoic era or Pre-Cambrian period. The only known deposits in the world have been discovered in the East Kimberleys, Western Australia.
The stone consists of a fine grained siliceous argillite (indurated siltstone or clay stone) with rhythmic patterns of red bands or spots contrasting sharply with a lighter background. It is not known how the regular patterns were formed, but the red stripes are colored by ferric (iron) oxide. Geologists have investigated Zebra Stone without producing any valid explanation of its origin. The stone's unsurpassed natural beauty typifies the color and spirit of Australia and some have said the stone has a special quality bringing luck. Most occurrences are now submerged beneath the dam waters of Lake Argyle. Since its discovery in 1924, it has been used widely as an ornamental stone.picture 1/. The first zebra stone was given to me by my mother ,she secretly pushed the stone in my hand and said: this one will bring you luck.picture 2/my collection.
The zebra stone is a jewel from a different kind i look at my collection often and love the mystery surrounding them,they feel so clean but robust and the patterns are so from another world ,I have fallen for this stone. picture from the web
Info on the zebra stone found at the world library.