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Festival of Geology 2020

Saturday 7th and Sunday 8th November 2020

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AMYGDALOIDAL BASALT LAVA - near Glasgow, Scotland

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Home > MINERALS > MINERALS FROM BRITAIN AND IRELAND FOR COLLECTORS > SCOTLAND, WALES AND IRELAND

   

AMYGDALOIDAL LAVA
   
340 million years old (Carboniferous period)

Boyleston Quarry, Barrhead, Renfrewshire, Scotland

A lovely example of volcanic lava from a Scottish volcano.

Basalt is a dark coloured igneous rock which is often full of gas bubbles. When the lava or magma hardens into rock the bubbles are left as cavities which are known as vesicles. Over time these cavities usually become filled with crystals of minerals. These crystal-filled cavities are known as amygdales. The name comes from the latin ‘amygdula’, an almond, because the filled bubbles were frequently flattened and looked like almonds.

Boyleston Quarry is a Site of Special Scientific Interest that is famous for its minerals. There are three thick lava flows here that are part of the Clyde Plateau Lavas. They were formed by fissure eruptions, which are cracks in the Earth's crust allowing liquid magma to escape to the surface.  

Provided with a comprehensive label as shown. The specimen was collected in 1981.
 
Click on a picture for a larger image


Size:  9.5 x 9 x 6 centimetres
Weight:  483 grams

PRICE: £16.00