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The copious contents of this paper are arranged under the three following heads:—1. A description of the sulphuret of lead mentioned in the title; 2. Observations on the various modes of attraction which influence the formation of mineral substances; and 3. Observations upon the different kinds of sulphuret of copper. 1. The cupro-antimonial sulphuret of lead, described in the first part, has hitherto been found only in Cornwall; and though many specimens of it are to be met with in various collections in the kingdom, yet no writer has hitherto taken any particular notice of it, nor has it been classed by any of the late compilers of mineralogical systems. Mr. Hatchett is the first who, on a careful analysis, has ascertained it to be a triple sulphuret, in which the sulphur is combined with lead, antimony, and copper; each of these ingredients exhibiting their characters in so striking a manner as to afford, in some measure, a new example of a natural compound in the mineral kingdom.

abstracts of the papers printed in the philosophical transactions of the royal society of london

Description of a triple sulphuret, of lead, antimony, and copper, from Cornwall; with some observations upon the various modes of attraction which influence the formation of mineral substances, and upon the different kinds of sulphuret of copper