fracture, in mineralogy, appearance of a surface broken in directions other than along cleavage planes. There are several kinds of fractures: conchoidal (curved concavities resembling shells—e.g., flint, quartz, glass); even (rough, approximately plane surfaces); uneven (rough and completely irregular surfaces, the commonest fracture type); hackly (sharp edges and jagged points and depressions—e.g., most metals); and splintery (partially separated splinters or fibres—e.g., jadeite [see photograph]). See also cleavage.
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Mineral detectives in the learning zone
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Image credit: Scott Brande
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Information on the mineral property Cleavage
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Fracture Mineral Collection for Earth science and geology contains six specimens that clearly illustrate different kinds of fractures.
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Difference Between Cleavage and Fracture Cleavage vs. Fracture While there are many meanings to the words cleavage and fracture, there are two definitions that are centered around geology, the study of rocks. Different rocks and minerals have different chemical structures giving them various characteristics like color, weight, density, strength, and clarity. Cleavage and fracture refer to the characteristics of rocks
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When we tested hardness, we were trying to scratch the specimen, not break it. For the next two tests, fracture and cleavage, we will be breaking the specimens. We are not looking at how difficult it is to break them. Instead, we will be looking at how they break, especially at the shape of those broken surfaces. Minerals that break in flat, smooth planes have a property
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