hackly fracture

hackly fracture

[¦hak·lē ′frak·chər]
(mineralogy)
A break in a mineral characterized by jagged irregular surfaces with sharp edges.
References in periodicals archive ?
The surfaces of most of the horizontal bands described above bear a hackly fracture pattern in which the hackles are oriented vertically, extending from the top to the base of an individual band (Figure 4(a)).