The Philosophical magazine; a journal of theoretical, experimental and applied physics . Epistilbite: Scorodite: Brazi Mr. E. J. Chapman on the Notation of Crystals. 329 Observations.— In this system, in accordance with the ge-neral custom, the longer horizontal axis is considered planes h% k3, &c. of the rhombic prisms of Levy and Du-frenoy correspond therefore to the planes D^ of the presentnotation, because they abut more immediately upon the shorteraxis. The planes g% g3, &c., on the other hand, are equiva-lent to Dm. A value following a letter, invariably refers
The Philosophical magazine; a journal of theoretical, experimental and applied physics . Epistilbite: Scorodite: Brazi Mr. E. J. Chapman on the Notation of Crystals. 329 Observations.— In this system, in accordance with the ge-neral custom, the longer horizontal axis is considered planes h% k3, &c. of the rhombic prisms of Levy and Du-frenoy correspond therefore to the planes D^ of the presentnotation, because they abut more immediately upon the shorteraxis. The planes g% g3, &c., on the other hand, are equiva-lent to Dm. A value following a letter, invariably refers tothe relative length of the shorter horizontal axis compared tothat of the longer one as unity. Naumanns symbols are, for D-, oo Pn; and for Dm, ccPn. The monaxial planes M and L form the vertical faces ofrectangular prisms; whilst the biaxial pyramidal planes, .rAand #E, produce rectangular octahedrons. Monoclinic Planes:—Basal planes, P. Back and front prismatic planes, and left prismatic planes, L. Diaxial Prismatic Planes:— Ordinary oblique rhombic prisms,D, D-, Dm. Dia
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