Conchoidal fracture in obsidian

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Close-up view of a conchoidal fracture in obsidian. Conchoidal fracturing is often said to resemble a clamshell, and is characteristic mineral property of pure silicates such as obsidian and window glass.
Close-up view of a conchoidal fracture in obsidian. Conchoidal fracturing is often said to resemble a clamshell, and is characteristic mineral property of pure silicates such as obsidian and window glass.
Filename: conchoidal_fracture.jpg
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