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Published online by Cambridge University Press: 14 March 2018
I have recently measured one of the crystals of the slag described by by Mr. A. E. Arnold, in vol. III, p. 114 of the Magazine. Observed forms :—
The angles are therefore almost identical with those derived by Miller (Trans. Phil. Soc., Cambridge, III; Brooke and Miller, Mireralogy, 1852, P. 319) from crystals found in refinery cinder, and the slags of copper furnaces, &c, —having the composition of Fayalite, viz.—2 FeO, SiO2.