hackly fracture
crystallography
Quick Summary
In mineralogy, hackly fracture describes a surface that breaks with sharp edges and jagged points and depressions. This type of fracture occurs when a crystalline substance breaks in directions other than along its natural cleavage planes. Unlike cleavage, which involves breaking along structurally weaker, planar surfaces, fracture happens when bond strengths are roughly equal throughout the crystal structure. Hackly fracture is commonly observed in metals.12
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