The Philosophical magazine; a journal of theoretical, experimental and applied physics . :>:>() Mr. lv .!. Chapman on the Notation of Crystal* Fie. 10. 7/vclinic System. Monaxial Planes: — P— M — L, as in the precedingsystem. Diaxiol Prismatic Planes:—; D-Dr. Diaxial Pyramidal Planes : — A; AA; E; EE: with their va-lues -, m. as above. Triaxial Pyramidal Planes:—O; OO; U; W; with their va-lues -, m. In conclusion, we will tabulate the proposed notation, forthe sake of reference, with those of Weiss and Rose, Nau-mann, Levy and Dufrenoy, and Mr. Griffin. It should beobserved, however
The Philosophical magazine; a journal of theoretical, experimental and applied physics . :>:>() Mr. lv .!. Chapman on the Notation of Crystal* Fie. 10. 7/vclinic System. Monaxial Planes: — P— M — L, as in the precedingsystem. Diaxiol Prismatic Planes:—; D-Dr. Diaxial Pyramidal Planes : — A; AA; E; EE: with their va-lues -, m. as above. Triaxial Pyramidal Planes:—O; OO; U; W; with their va-lues -, m. In conclusion, we will tabulate the proposed notation, forthe sake of reference, with those of Weiss and Rose, Nau-mann, Levy and Dufrenoy, and Mr. Griffin. It should beobserved, however, that the latter author adopts throughouteach crystallographic group one uniform system of three rec-tangular axes, differing only in regard to their relativelengths*.In the following tables the forms are arranged in accordancewith the number of axes which they cut, monaxial formsbeing placed first. Monometric PA o iO ? mOn Weiss andRose. Xau- mann. a : oca : x« xOx a : a : xa xO a : ma : cxa ocOn a: a: a O a • a • haa, a: ma 1 ia . —a : —n mOrnmO?i Levy and F. the cube. i{=bbmb*) P, M, , ,M + ,P+M,P-T,P++ * System of Crystallography, with its Applications to Mineralogy. 1841. Mr. E. J. Chapman on the Notation of Crystals. 331 Dimetrtc System. Weiss and Rose. Naumann. Levy and F. a square prism. Griffin. xa : xa : c OP P P M xa?xr xPx M M ; T D a : a : ii xP h MT Dm a : na : xc ccPk If M—T, M+f A a:xa:c Px V ] ^ a : oca : —c »Px b >\l, Pj-T m.\ a : oca : mc wPx b« J o a : a : c p « ] ho a : a : —c p»p a V P*MT mO a: a -. mc B»P « J mOn a :na : mc mP?i i(=bb»h») . PxMzTj/ Hexagonal System. Weiss and Rose. Nau- mann. Levy and hexagonal prism Griffin. P xa : xa : xa : c OP P P D a: a: <xa : ccc ccP M jM, M2T^ T 2a: a : 2a : xc xP2 k T, MUT2 0 a : a
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