MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Tuff volcanic rock and mineral deposits, close-up. These laminated tuffs formed from volcaniclastic sediments and date to 575 million years ago. Some of the rocks here contain some of the oldest fossils in the world, and some of the oldest rocks in the UK. They are found on Beacon Hill, Leicestershire, UK, within the upland tract known as Charnwood Forest. The mineral deposits may be an iron oxide (orange) and a blue mineral such as sodalite or lazurite (both aluminosilicates with chlorine or sulphur). Cleavage of existing rocks expose mineral deposits such as these.
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