Obsequious Obsidian

Was missing a bit of obsidian for the little book, and Vangelis scanned me a piece. Obsidian with stripes (as this piece) shows the flow of the glassy material (like Venetian glass). The conchoidal fracture is due to the fact that there is no mineral structure, this is a "mineraloid" after all. Every archeologist in Greece has brought me little bits of black shiny artefacts hoping they are obsidian: apparently the stone age Greeks made knives and arrow points from obsidian from Milos Island (where there's a volcano), and to find an artefact of obsidian shows something about ancient trade. However, none of their little bits proved to be obsidian, most little bits of black chert of even serpentine. To see it, is to know it.