An obsidian core from which flakes were broken off to use as cutting tools. It belonged to a set of grave goods from a Neolithic burial site some 6,000 years old. Obsidian is rare in the Western Mediterranean and absent from the entire Iberian Peninsula. The Neolithic communities of Catalonia, however, were aware of obsidian and appreciated its extraordinary properties for producing sharp tools, so they procured a supply despite their distance from the sources. This particular piece of obsidian comes from Sardinia and was found in the necropolis of Bòbila Padró - Can Tiana (Ripollet).