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HOLLOW IRONSTONE CONCRETION

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Home > MINERALS > UNUSUAL ROCKS AND MINERALS - WEIRD AND WONDERFUL !
 

HOLLOW IRONSTONE CONCRETION
 
In sandstones iron is usually present in the groundwater and it is often deposited as hard, insoluble layers of iron oxide.  Odd-shaped concretions are sometimes formed consisting of concentric layers of iron minerals such as limonite and goethite.  

Some concretions are hollow and filled with loose sand. These were probably formed when the iron originally cementing the sand grains was dissolved and drawn to the outside, forming this curious iron oxide ‘shell’.  

This is a nice little example. One for the collector of unusual works of nature!


Click on a picture for a larger image

Size: 4 x 4 x 4.5 centimetres
Weight:  62 grams

PRICE: £10.00
Sorry, this item has been sold or is out of stock
HOLLOW IRONSTONE CONCRETION
HOLLOW IRONSTONE CONCRETION HOLLOW IRONSTONE CONCRETION HOLLOW IRONSTONE CONCRETION HOLLOW IRONSTONE CONCRETION