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BASALT - Isle of Mull, Scotland

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

 
BASALT
  
Isle of Mull, Scotland
  
The mountains of the south of the Isle of Mull are the roots of a huge volcano that erupted 60 million years ago. It is part of the Hebridean Igneous Province which is associated with the opening of the Atlantic Ocean. Before this time, north-western Europe, Greenland and North America were all part of one huge continent.
  
The slow cooling of magma deep beneath the Earth's surface formed a coarsely crystalline igneous rock called gabbro. As this magma erupted at the surface, vast quantities of lava were produced which cooled to form fine-grained basalt. Basalt lava flows form the bedrock of a large part of the island.
  
This specimen is a picrite basalt which is rich in the mineral olivine. It was formerly part of a university collection.

Click on a picture for a larger image


Size:  9 x 8 x 6 centimetres
Weight:  389  grams

PRICE: £12.00