Black marbles grouped under the name Belgium Black marbles refers to several types of black marbles, from Wallonia. The concentration of these mines is due to the presence of the Namur syncline. This geological specificity came back to the time of Paleozoic era, Devonian period and Frasnian stage, which occured more than 380 million years ago. At that time, the first terrestrial vertebrates were crawling on earth and the first seed plants and trees were growing. Thanks to this composition of organic matter, the Belgian Black has a deep black, free from any veins or patterns.
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