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Published online by Cambridge University Press: 14 March 2018
In this Paper the author directs attention to some localities in Scotland where the aetinolite forms of hornblende are to be found.
In Aberdeenshire the actinolite occurs as sheaf-like groups, irregularly distributed through a felspathic base ; also as slender crystals, extending sometimes to the length of eighteen inches, in a dioritic rock. On the hill of Heshgarnich, in Perthshire, this variety of hornblende occurs in nests, also in fan- or sheaf-like bundles of a black colour ; and on the north side of the hill it is found in blade-like forms distributed through a glistening micaceous schist.