'Obsidian, Showing Conchoidal Fracture'

'Obsidian, Showing Conchoidal Fracture'

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Credit: JOEL AREM/SCIENCE PHOTO LIBRARY

Caption: Fracture describes the way a mineral breaks when it does not display cleavage, the tendency to split along specific planes. Fracture is described with terms such as hackly, even, uneven, fibrous, splintery, etc. Conchoidal fracture resembles the curved lines of a clamshell, and is characteristic of the way glass breaks. Obsidian fractures this way because it is volcanic glass.

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Keywords: arem collection, clamshell, conchoidal, conchoidal fracture, curved lines, even, fibrous, fracture, geological, geology, glass, hackly, mineral, mineral properties, mineralogy, minerals, natural glass, properties, specimen, splintery, tests, uneven, volcanic glass

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