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Obsidian The natural glass obsidian forms when molten rock rapidly cools. Due to its softness, it is most often worn as earrings or pendants as it is a popular gemstone with a black color. Breaking it creates cutting tools that are very sharp. Prehistoric peoples used it for this purpose. We use it today to produce surgical blades. Luster Typically, obsidian has a vitreous (glass-like) luster. Transparency The stone often has a translucent appearance. Cleavage Obsidian typically …