Well-developed crystals of non-magnetic artificial pyrrhotite displaying two new crystallographic forms appeared in the products of certain experiments designed primarily for the synthesis of lead-bismuth sulphides from strongly alkaline sodium sulphide solutions. These Solutions, held in a bomb at about 1200 bars and 400° C., attacked the steel walls and, after cooling, were found to have precipitated part of the iron in combination with the sulphur of the charges as lustrous bronze-brown crystals of pyrrhotite. Various habits, platy, equidimensional, columnar, and fibrous, were displayed by individuals sometimes reaching a greatest dimension of two or three millimetres. The perfection and excellent development of these crystals, as well as the rarity of good crystals of pyrrhotite in nature, made worthwhile a goniometric and x-ray study.

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