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Obsidian differentiates between core plugins, which are released and maintained by the Obsidian team, and community plugins, which are open-sourced through GitHub and are contributed by users. [19] Examples of community plugins include a Kanban-style task board and a calendar widget. [4] There are over 200 community made themes to use with the app.
Obsidian projectile point.. Obsidian is a naturally formed volcanic glass that was an important part of the material culture of Pre-Columbian Mesoamerica.Obsidian was a highly integrated part of daily and ritual life, and its widespread and varied use may be a significant contributor to Mesoamerica's lack of metallurgy.
The source of obsidian for cultures inhabiting the territory of and around Greece was the island of Milos; the Starčevo–Körös–Criș culture obtained obsidian from sources in Hungary and Slovakia, while the Cardium-Impresso cultural complex acquired obsidian from the island outcrops of the central Mediterranean.
Ingot molds are tapered to prevent the formation of cracks due to uneven cooling. A crack or void formation occurs as the liquid to solid transition has an associated volume change for a constant mass of material. The formation of these ingot defects may render the cast ingot useless and may need to be re-melted, recycled, or discarded.
The "black" in "blacksmith" refers to the black firescale [citation needed], a layer of oxides that forms on the surface of the metal during heating.The origin of smith is the Old English word smið meaning "blacksmith", originating from the Proto-Germanic *smiþaz meaning "skilled worker".
The name of his father appears as Esarg or Tuirbe Trágmar, the 'thrower of axes'. [6] Goibniu is often grouped together with Credne the silversmith and Luchta the carpenter as the Trí Dée Dána (three gods of art), who forged the weapons which the Tuath Dé used to battle the Fomorians.
When the metal had cooled and hardened, the smaller ingots (the "pigs") were simply broken from the runner (the "sow"), hence the name "pig iron". [4] As pig iron is intended for remelting, the uneven size of the ingots and the inclusion of small amounts of sand are insignificant issues when compared to the ease of casting and handling.
Antimony is a member of group 15 of the periodic table, one of the elements called pnictogens, and has an electronegativity of 2.05. In accordance with periodic trends, it is more electronegative than tin or bismuth , and less electronegative than tellurium or arsenic .