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Radiolarite

Red and green stones, edged and criss-crossed by calcite veins - radiolarite bring colours to grey gravel banks!
To get to the location of emergence of these rocks one has to use a diving robot. In deep sea areas (3,500 – 5,000m) of the Pantalassan Ocean it emerged from radiolarian skeletons 150 million ago.  

Radiolarians are single-celled organisms. Their inner skeleton consists of silica crystals, which unlike limestone compounds do not dissolve, even in such a depth.

Radiolarites are hard rocks. During the Stone Age it was used to make tools such as arrowheads.



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