Australia Zebra Stone

Zebra rock or Zebra stone is a distinctive reddish-brown and white banded claystone from the Ord River area of Western Australia where it forms discontinuous lenses within a Late Proterozoic shale sequence. 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. It is composed of small particles of quartz, white mica, clay minerals, hematite and alunite. The striking colour banding was probably formed after the original sediments were deposited by the rhythmic precipitation of hematite-rich bands during alteration of the rock in a highly oxidising environment.

The deposit is 600 million years old, placing it in the Upper Proterozoic era or Pre-Cambrian period. It has a very fine texture, like that of unglazed porcelain. The dark spots have the same texture as the light areas, and are colored by Hematite (iron oxide). The formation of the spots is mysterious, but is clearly the result of a three-dimensional reaction-diffusion type instability. Other, more exotic explanations have been proposed.

Return to Index Main Australia Page Questions?

 

(Click Photo to Enlarge)

Name:    Cooperia tubiformis   
Geologic Age:     PreCambrian
Stratigraphic Detail:  Kimberley Range (Ord River)
Location:   Kunnurra, Western Australia
Description:     These specimens have been cut and polished to bring out the exquisite beauty that they possess.  Very interesting specimens!  This one measures approx.  1 5/8" x 4 5/8"

Australia Zebra Stone 4 Price $25.00


(Click Photo to Enlarge)

Name:    Cooperia tubiformis   
Geologic Age:     PreCambrian
Stratigraphic Detail:  Kimberley Range (Ord River)
Location:   Kunnurra, Western Australia
Description:     These specimens have been cut and polished to bring out the exquisite beauty that they possess.  Very interesting specimens!  This one measures approx.  2 3/8" x 3 3/4"

Australia Zebra Stone 8 Price $25.00


(Click Photo to Enlarge)

Name:    Cooperia tubiformis   
Geologic Age:     PreCambrian
Stratigraphic Detail:  Kimberley Range (Ord River)
Location:   Kunnurra, Western Australia
Description:     These specimens have been cut and polished to bring out the exquisite beauty that they possess.  Very interesting specimens!  This one measures approx.  2 1/2" x 3.5"

Australia Zebra Stone 11 Price $25.00