Obsidian’s one key advantage as a sword of any form is its sharpness on soft, organic material. So, as an impact weapon, what would be produced would be completely useless. Without any kind of internal structure to strengthen it, obsidian tends to be highly malleable to impact and shock, showing ripple waves going through it during impact and fracturing almost immediately. In terms of the actual casting into a sword form, assuming one had the tooling and means to cool the melted obsidian down into the new form, the end product would be a very brittle sword form that was easily breakable just from trying to pull it out of the cast.Īgain, obsidian is essentially a rock form of glass. Instead, it would need to be air-cooled, similar to what one does when forming a glass bottle. In an artificial setting, the typical cooling process involves quenching of metal.Ī sudden shock of cooling would shatter the obsidian and produce lots of fragments instead of a solid cast. Naturally, obsidian cools over a period of time when it forms into is glass-like state.
Most facilities simply don’t have the tooling to handle that kind of temperature. While this is not a problem inside a volcano, man-made melting conditions would need to reach at least 1,710 degrees Fahrenheit for the silicon part of the obsidian and 2,072 for pure liquification of everything else in the mix. The heat point at which obsidian starts to melt and become liquid form is intense and considerable. It is made up of about 70 percent silicon dioxide as well as a lot of contaminants from aluminum oxide and anything else that got picked up during the volcanic creation process. Why Obsidian is So BrittleĪs a material, obsidian is essentially a melted silicon mixture, i.e. That said, people still try silly things. While it can be shaped, melting it would take significant resources, and it would never function as a practical sword. While obsidian is extremely sharp, it has historically been used as a blade such as a dagger.
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In the hit cable HBO TV series, Game of Thrones, the bad ice demon people were killable using the equivalent of an obsidian sword, except in the show it was called dragon-glass. Leave it to Hollywood to create possibilities with pure fiction. Can You Melt Obsidian and Cast a Sword? (EXPLAINED)
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