Manganese dioxide is abundant in nature, and owing to their colour, these oxides have been used as pigments since the Stone Age. Some of the cave paintings in Lascaux, France, for example, were produced with manganese-based pigments. In a series of compositional analyses, scientists from Leiden University and Delft University of Technology conclude that Neanderthals at Pech-de-l'Azé I in South Western France had a strikingly different use for this mineral 50,000 years ago.

During excavations at several Neanderthal sites in France large numbers of small black 'blocs' where found. The usual interpretation is that these chunks of 'manganese oxides' were used for their colouring properties in body decoration, potentially even for symbolic expression. However Neanderthals habitually used fire and if they needed black material for decoration, soot and charcoal were readily available, whereas manganese oxides would have necessitated a considerably higher investment in both time and energy to obtain.

The Leiden-Delft team concludes that late Neanderthals at Pech-de-l'Azé I were deliberately collecting manganese dioxide for a different purpose. Statistically designed combustion experiments and thermo-gravimetric (TGA) measurements demonstrate that manganese dioxide reduces wood's auto-ignition temperature and substantially increases the rate of char combustion; in other words, manganese dioxide facilitates the making of fire. Archaeological evidence for both fire places and the grinding of manganese dioxide blocs to powder supports the hypothesis that Neanderthals at Pech-de-l'Azé I used manganese dioxide to make fire.

The use of fire would have provided important benefits that make up for the time and energy spent collecting the manganese. Furthermore the social and symbolic significance of fire should not be overlooked.

Manganese dioxide blocs from Pech de l’Azé (France), both unmodified (b and d) and abraded (a and c). Image by Peter Heyes

The selection and use of manganese dioxide for fire making is unknown from the ethnographic record of recent hunter-gatherers. It therefore provides potential significant insights into Neanderthal cognitive capabilities. The actions involved in the preferential selection of a specific, non-combustible material and its use to make fire are not obvious nor intuitive. The knowledge and insights suggested by Neanderthal selection of manganese dioxide and use in fire-making are surprising and qualitatively different from the expertise commonly associated with Neanderthals.

Authors: Peter J. Heyes, Konstantinos Anastasakis, Wiebren de Jong, Annelies van Hoesel, Wil Roebroeks, and Marie Soressi : Selection and Use of Manganese Dioxide by Neanderthals Scientific Reports | 6:22159 | DOI: 10.1038/srep22159