More than a century ago, Alfred Lemonnier, Director of phosphatic chalk quarries in the Mons region, donated a jadeitite axehead from Spiennes to the State among a small collection of 'knapped flint'. Originally, this artefact was 12 to 15 cm long. Several scientists tested various ways – destructive or non-destructive – to determine this green stone until they discovered their origin in the ultimate end of the Alps near Genoa (Italy), thanks to Projet JADE. But this raises a new question: how to explain the presence of an almost complete axehead of jadeitite in the midst of the flint extraction site of Spiennes?
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