£0.00View All
(0) Shopping Cart
Currency
FORTHCOMING EVENTS

   

The 'Virtual'

Festival of Geology 2020

Saturday 7th and Sunday 8th November 2020

Save the dates!​​​​​​​

  

​​​​​​​

BANDED IRONSTONE (POLISHED PIECE) - 2.5 billion years old - Australia

« back
Home > MINERALS > PRECIOUS AND SEMI-PRECIOUS GEMSTONES

BANDED IRONSTONE
cut and polished piece

2.5 billion years old

Ord Range, Western Australia

 
A piece of Banded Ironstone Formation of Western Australia which has been cut and polished on one side with the other side 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:  12 x 5 x 4 centimetres
Weight: 465 grams

PRICE: £35.00
Sorry, this item has been sold or is out of stock
BANDED IRONSTONE (POLISHED PIECE) - 2.5 billion years old - Australia
BANDED IRONSTONE (POLISHED PIECE) - 2.5 billion years old - Australia BANDED IRONSTONE (POLISHED PIECE) - 2.5 billion years old - Australia BANDED IRONSTONE (POLISHED PIECE) - 2.5 billion years old - Australia BANDED IRONSTONE (POLISHED PIECE) - 2.5 billion years old - Australia