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n.1.(Min.) A variety of pyroxene.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
This location is but one city-block south of the great marble gateway], malacolite [diopside], tremolite, asbestos, brown tourmaline [uvite], muscovite, foliated talc and gypsum.
Forty years later Manchester (1931) considered diopside (calling it "malacolite," a now discredited name) a common mineral of the marble, often found in crystals standing out in relief on the more soluble weathered matrix, and illustrated such a specimen in his plate 42.
I personally collected these diopside crystals as a boy in the 1940's when they were still known locally as malacolite. I remember vividly banging them out of their marble matrix with my hammer and chisel while seated on the ground and then being threatened with arrest by a gruff Irish policeman.