The Philosophical magazine; a journal of theoretical, experimental and applied physics . Apophyllite: Faroe-Fig. Mr. E. J. Chapman on the Notation of Crystals. .527 the mineral, if not altogether hypothetical, I would select thatForm most in keeping with the prevailing character of thecrystallization ; and therefore, sometimes an octahedron withWeiss and his disciples, and sometimes a prism with Levyand Dufrenoy. It would, however, be still better, as the pro-posed notation, unlike those of the above crystallographers,has no dependence upon the actual external shape of the fun-damental for
The Philosophical magazine; a journal of theoretical, experimental and applied physics . Apophyllite: Faroe-Fig. Mr. E. J. Chapman on the Notation of Crystals. .527 the mineral, if not altogether hypothetical, I would select thatForm most in keeping with the prevailing character of thecrystallization ; and therefore, sometimes an octahedron withWeiss and his disciples, and sometimes a prism with Levyand Dufrenoy. It would, however, be still better, as the pro-posed notation, unlike those of the above crystallographers,has no dependence upon the actual external shape of the fun-damental form, to name merely the relative lengths of theaxes, thus: protaxialjbrm =-756 X(idocrase); or 554 X950,&c, the value before the symbol to be considered the relativelength of the vertical axis, and that after the symbol to referto one of the lateral axes, the other axis being unity. Theprotaxial forms of the different systems would be then as fol-lows:—monometricsystem, X; dimetricand hexagonal systems,.rX ; other systems, #Xa\ In the inclined systems the incli-nations of the axes should of course also be g
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