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Festival of Geology 2020

Saturday 7th and Sunday 8th November 2020

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BANDED IRONSTONE ('TIGER IRON') (POLISHED SLICE) - 2.5 billion years old - Australia

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

2.5 billion years old

Ord Range, Western Australia

 
A nice example of the Banded Ironstone Formation of Western Australia with good folding. It is polished on both sides. This example is called 'tiger iron' because it contains bands of 'tigers eye' quartz. It is commonly used in jewellery.
 
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. 
  
A plastic stand is included.

Click on a picture for a larger image


Size:  12.5 x 8.5 x 0.7 centimetres
Weight: 163 grams

PRICE: £30.00
BANDED IRONSTONE ('TIGER IRON') (POLISHED SLICE) -  2.5 billion years old - Australia
BANDED IRONSTONE ('TIGER IRON') (POLISHED SLICE) -  2.5 billion years old - Australia BANDED IRONSTONE ('TIGER IRON') (POLISHED SLICE) -  2.5 billion years old - Australia BANDED IRONSTONE ('TIGER IRON') (POLISHED SLICE) -  2.5 billion years old - Australia BANDED IRONSTONE ('TIGER IRON') (POLISHED SLICE) -  2.5 billion years old - Australia