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BANDED IRONSTONE (POLISHED SLICE WITH SUPERB FOLDING) - 2.5 billion years old - Australia

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Home > MINERALS > PRECIOUS AND SEMI-PRECIOUS GEMSTONES

BANDED IRONSTONE
cut and polished slice

2.5 billion years old

Ord Range, Western Australia

 
A very good example of the Banded Ironstone Formation of Western Australia with superb folding. It is polished on one side.
 
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:  15 x 13 x 0.8 centimetres
Weight: 448 grams

 
Optional metal stand (£1)

PRICE: £66.00
BANDED IRONSTONE (POLISHED SLICE WITH SUPERB FOLDING) - 2.5 billion years old - Australia
BANDED IRONSTONE (POLISHED SLICE WITH SUPERB FOLDING) - 2.5 billion years old - Australia BANDED IRONSTONE (POLISHED SLICE WITH SUPERB FOLDING) - 2.5 billion years old - Australia BANDED IRONSTONE (POLISHED SLICE WITH SUPERB FOLDING) - 2.5 billion years old - Australia BANDED IRONSTONE (POLISHED SLICE WITH SUPERB FOLDING) - 2.5 billion years old - Australia