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

​​​​​​​

​​​​​​​

ANDESITE - Cheviot Hills, Northumberland

« back
Home > MINERALS > UNUSUAL ROCKS AND MINERALS - WEIRD AND WONDERFUL !
  
ANDESITE
  
Cheviot Hills, Northumberland
  
The Cheviot volcano was active around 400 million years ago at the time of the closure of the Iapetus Ocean between what is now England and Scotland. As is typical of volcanoes above subduction zones, it produced a lava called andesite, named after the Andes mountains.  
  
Because the lavas cooled rapidly at the surface, they are generally composed of small crystals too small to see with the naked eye, but occasionally, they also contain large crystals of feldspar, amphibole, or pyroxene, which began forming within the magma as it was cooling at depth. 
  
​​​​​​​Click on a picture for a larger image

Size:  8 x 6 x 3.5 centimetres
Weight:  199 grams

PRICE: £12.00