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Obsidian artifacts are common at Tell Brak, one of the earliest Mesopotamian urban centers, dating to the late fifth millennium BC. [44] Obsidian was valued in Stone Age cultures because, like flint , it could be fractured to produce sharp blades or arrowheads in a process called knapping .
Despite being sharper, prismatic obsidian is also considerably more brittle than steel; obsidian blades of the type used on the macuahuitl tended to shatter on impact with other obsidian blades, steel swords or plate armour. Obsidian blades also have difficulty penetrating European mail. The thin, replaceable blades used on the macuahuitl were ...
Opal was rare and very valuable in antiquity. In Europe, it was a gem prized by royalty. [19] [20] Until the opening of vast deposits in Australia in the 19th century the only known source was Červenica beyond the Roman frontier in Slovakia. [21] Opal is the national gemstone of Australia. [22]
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.
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A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one letter, while the black squares are used to ...
Apache tears, a kind of nodular obsidian. Tachylite (also spelled tachylyte), a basaltic glass with relatively low silica content. Sideromelane, a less common form of tachylyte. Palagonite, an alteration product of basaltic glass. [8] Hyaloclastite, a hydrated tuff-like breccia of sideromelane and palagonite.
Obsidian (Transformers), a Transformers character; Obsidian, a character in the animated TV series Trollz; Obsidian, a character in the Cartoon Network series Steven Universe; Obsidian, a synonym for dragonglass, which kills White Walkers and their soldiers in Game of Thrones; Obsidian Order, the fictional Cardassian intelligence agency from ...