ˈmakəl noun
( -s )
Etymology: French, wide-meshed net, mascle, macle, from Old French, mesh, lozenge voided — more at mascle
1. : chiastolite
2.
a. : a twinned crystal
b. : a flat often triangular diamond that is usually a twinned crystal
3. : a dark or discolored spot (as in a mineral specimen)