Kimberley Siltstone

Located in Australia’s North West at the northern end of Lake Argyle, these stones are found nowhere else in the world. Dating Back more than 1200 million years they are truly a unique piece of nature. Below are the 5 types of rock we work with in our workshop...

Zebra Rock

Zebra Rock

Zebra rock is a siliceous silt stone with markings like that of the zebra. It has red/ brown bands or spots on a white or cream background. The red/ brown colouring is due to the presence of iron oxide (haematite) which is lacking in the white/ cream material. Zebra Rock has been placed at approximately 670 million years old. It is unknown how this incredibly rock was formed.

Ribbon Stone

Ribbon Stone

The colours in this stone range from light to dark greys, reds, burgundies, black, tans, creams, oranges and more. Patterns in the stone vary enormously ranging from stripes to spots and streaks, or a mixture of all. Thin layers of zebra stripes can also be found and often scenic pictures can be seen. Naturally occurring fault lines or fractures which have been gradually glued back together overtime, are also a very common feature of this stone. White spots in the stone have been identified as petrified algae, which being a plant material has help date the stone back more than 1200 million years.

Okapi Rock

Okapi

Okapi is very similar to Zebra Rock being of the same materials, however lacking the perfectly uniform stripes. It was therefore named after a rare mammal with stripes on its hind legs similar to that of the zebra. Okapi is formed horizontally in the ground, layer upon layer. The layers range in colour from rich browns to soft pinks, creams and whites.

Ning Bing

Ning Bing

Ning Bing is a unique sandstone found north of Kununurra out on the coast. The magnificent colours in this stone range through all the hues of the rainbow also giving it the name Rainbow stone. The fine lined patterns have been likened to those in indigenous paintings. The stone is also named after the Ning Bing Ranges and the Ning Bing Community, which are located on the way to where it is found.

Astronomite

Astronomite

This chocolate coloured stone, with its pinky orange circles was believed to be formed when a chemical reaction occoured between ilmenite (titanium dioxide) and the mud in which it was embedded. The reaction created bubbles which became trapped in the mud and eventually solidified. The bubbles are dispersed randomly throughout the stone and vary in size giving it the appearance of the night sky.

Sedimentary rocks are formed from the acculmulation of sediments, consisting of rock fragments, plant and animal products, products of chemical reaction or of evaporation. Forming in layered deposits this type of rock is created over millions of years.

Siltstone is a fine grained layered sedimenary rock comprised primarily of silt-sized particles cemented together. Zebra Rock, Ribbon Stone, Astronomite, and Okapi are all examples of siltstone found here in the North Kimberley.

Sandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains. Ning Bing is an example of a sandstone.