Marra Mamba Tiger Iron

Marra Mamba Tiger Iron comes from western Austrlia and dates to 2.5 billion years ago, during the Precambrian Eon. This is close to some of the oldest rocks on earth, at about 3.5 billion years ago. Marra Mamba is a variety of tiger iron with reds, blues, yellows and golds. The iron stone formed during a time when there was little oxygen in the atmosphere. Oxygen-producing bacteria that lived in the oceans released oxygen into the atmosphere, which dissolved into sea water. Iron from underwater volcanoes reacted with this oxygen, producing iron oxide. This resulted in banded iron formation, layers of iron oxide (hematite) with chert. The layers underwent alteration to form the mineral riebekite, a fibrous asbestos mineral. With further alteration in mountains, the riebekite was replaced with silica, forming the tiger iron. About 2000 million years ago, when a supercontinent (all the continents had come together) started breaking up, the silica layers dissolved, leaving behind just the iron stone.

Marra Mamba has beautiful color variations and tight chatoyance.

Please enlarge and view the photographs for more detailed views. Shown wet to simulate polish. As with all natural rock, there may be fractures or pits to seal or work around. Each slab has the approximate dimensions listed. I use the longest and widest point and the thinnest, it’s not averaged.

If you like this material, you may also like tigers eye and binghamite/silkstone.

We have worked hard with the lighting and the settings on the camera so that the colors are very accurate. Individual settings may affect color viewing on various devices and I cannot predict what your device will do, but on my computer, they’re dead on for color. I appreciate your business!

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