a green or brownish-black variety of the mineral augite in the form of layers of platelike crystals
Word origin
C19: from Greek diallagē interchange
diallage in American English
(ˈdaɪəˌlɪdʒ)
noun
a greenish mineral that is a laminated variety of monoclinic pyroxene
Word origin
Fr < Gr diallagē, change, interchange < diallassein, to interchange < dia, through (see dia-) + allassein, to alter < allos, other (see else): so named from having unlike fracture planes