The crystals here described were sent by Dr. J. E. Stead, F.R.S., for crystallographic determination. They came from a 'bear' or mass of metal weighing about 800 tons that had solidified at the bottom of one of the blast-furnaces of Messrs. Cochrane & Co., Ltd., at Ormesby, near Middlesborough. They are present only in sparing amount in drusy cavities, and are absent in the mass of metal itself.
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