The Philosophical magazine; a journal of theoretical, experimental and applied physics . ize in drawings often preventsthe complete symbol, which is exactly similar to that of Nau-mann, from being employed in their lettering; for whichreason any conventional sign may be used for that purpose,and the exact notation placed beneath the figure: as, or *=2cn, &c. Fig. 3. Dimetric System. Monaxial Planes:—Basal planes, planes, M. Diaxial Prismatic Planes :— Vertical planes alternating in position withthose of the ordinary square prisms, prisms, D/«. Diaxial Pyramidal Planes
The Philosophical magazine; a journal of theoretical, experimental and applied physics . ize in drawings often preventsthe complete symbol, which is exactly similar to that of Nau-mann, from being employed in their lettering; for whichreason any conventional sign may be used for that purpose,and the exact notation placed beneath the figure: as, or *=2cn, &c. Fig. 3. Dimetric System. Monaxial Planes:—Basal planes, planes, M. Diaxial Prismatic Planes :— Vertical planes alternating in position withthose of the ordinary square prisms, prisms, D/«. Diaxial Pyramidal Planes :— Ordinary square-based octahedrons, A, m Triaxial Planes:— Octahedral planes alternating in position with the above, O, -O, ?, ?nOfi. Zircon : Frederiksvam. Observations.—In this system, and in those which follow, afundamental form must be chosen for each mineral as in theusual notations, but with this difference : that whereas theGerman crystallographers choose invariably pyramidal formsfor this purpose, often quite opposed to the crystallization of. Apophyllite: Faroe-Fig. 4.
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