2.
Arrow-head; opake obsidian: Teleohuacan.3.Knife or Razor of Obsidian; shown in two aspects; Mexico.4.

Leaf-shaped Knife or Javelin-head; obsidian: from Real Del Monte.5.

Spear-head of Chalcedony; one of a pair supposed to be spears of State: found in excavating for the Casa Grande, Tezcuco.

(This peculiar opalescent chalcedony occurs as concretions, sometimes of large size, in the trachytic lavas of Mexico.)] Cortes found the barbers at the great market of Tlatelolco busy shaving the natives with such razors, and he and his men had experience of other uses of the same material in the flights of obsidian-headed arrows which "darkened the sky," as they said, and the more deadly wooden maces stuck all over with obsidian points, and of the priests' sacrificial knives too, not long after.

These things were not cut and polished, but made by chipping or cracking off pieces from a lump.