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BANDED IRONSTONE (CUT AND POLISHED) - 2.5 billion years old - Australia

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BANDED IRONSTONE
​​​​​​​('TIGER IRON')
cut and polished

2.5 billion years old

Ord Range, Western Australia

 
A good example of the Banded Ironstone Formation of Western Australia. One face has been cut and polished and the others are natural.

Banded ironstone provides unique evidence of the early history of life on Earth. It was formed under the sea by iron reacting with oxygen to form iron oxide (rust). This rock therefore provides the first evidence of oxygen appearing in the Earth's atmosphere, the oxygen being produced by rapidly increasing numbers of primitive, single celled algae - the only life forms at that time. These algae were for the first time using sunlight as a source of energy and producing oxygen as a by-product.
 
Banded ironstone is also an important iron ore. This example has been subjected to heat and pressure (metamorphosed) which has produced bands of magnetite and jasper.

Some examples are called 'tiger iron' because they contain bands of 'tigers eye' quartz. It is commonly used in jewellery.

Click on a picture for a larger image


Size:  8 x 7 x 4 centimetres
Weight: 470 grams

PRICE: £38.00
Sorry, this item has been sold or is out of stock
BANDED IRONSTONE (CUT AND POLISHED) - 2.5 billion years old - Australia
BANDED IRONSTONE (CUT AND POLISHED) - 2.5 billion years old - Australia BANDED IRONSTONE (CUT AND POLISHED) - 2.5 billion years old - Australia BANDED IRONSTONE (CUT AND POLISHED) - 2.5 billion years old - Australia BANDED IRONSTONE (CUT AND POLISHED) - 2.5 billion years old - Australia