In mineralogy, the appearance of a surface broken in directions other than along cleavage planes. There are several kinds of fractures: conchoidal (curved concavities resembling shells, as in glass); even (rough, approximately plane surfaces); uneven (rough and completely irregular surfaces, the commonest type); hackly (sharp edges and jagged points and depressions); and splintery (partially separated splinters or fibres).

This entry comes from Encyclopædia Britannica Concise.
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