View your list of saved words. (You can log in using Facebook.)
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. For the full entry on fracture, visit Britannica.com.