der Akad. zu
Berlin', 1822-23, s. 40); of oliving by Seifstrom (Leonhard,
'Basalt-Gebilde', bd. ii., s. 495); of mica in old scoriae of Schloss
Garpenberg (Mitscherlich, in Leonhard, op. cit., s. 506); of magnetic iron
in the scoriae of Chatillon sur Seine (Leonhard, s. 441); and of micaceous
iron in potter's clay (Mitscherlich, in Leohnard, op. cit., s. 234).
[See Ebelmer's papers in 'Ann. de Chimie et de Physique', 1847; also 'Report
on the Crystalline Slags', by John Percy, M.D., F.R.S., and William Hallows
Miller, M.A., 1847. Dr. Percy, in a communication with which he has kindly
favored me, says that the minerals which he has found artificially produced
and proved by analysis are Humboldtilite, gehlenite, olivine, and magnetic
oxyd of iron, in octahedral crystals. He suggests that the circumstance of
the production of gehlenite at a high temperature in an iron furnace may
possibly be made available by geologists in explaining the formation of the
rocks in which the natural mineral occurs, as in Fassathal in the Tyrol.] --
Tr.
[footnote] **Of minerals purposely produced, we may mention idocrase and
garnet (Mitscherlich, in Poggend., 'Annalen der Physik', bd. xxxii., s.
340); ruby (Gaudin, in the 'Comptes Rendus de l'Academie de Science', t.
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