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VESICULAR BASALT - Arizona

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

  

VESICULAR BASALT

Phelps Dodge Well No.1, Ajo, Pima County, Arizona, USA

Basalt is a dark coloured volcanic rock and when it erupts at the surface it is often full of gas bubbles which formed as the pressure was released on eruption. When the lava hardens into rock the bubbles are left as cavities which are known as vesicles. A volcanic rock with gas bubble cavities is known as vesicular.

If these cavities become filled with crystals of minerals, the filled cavities are known as amygdales and the rock is known as amygdaloidal.

This example of basalt has a high iron content which gives the rock an attractive red colouring.

Click on a picture for a larger image


Size:  7 x 6 x 4 centimetres
Weight:  111 grams

PRICE: £12.00
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