130 



Tiik Ottawa Naturalist. 

 SYSTEMS OF CRYSTALLIZATION. 



Name. 



[si imetric. 



Tessttlar, Mohs & Haidinger. 

 Isometric, 1 lansmann. 

 Tes ri ral, Naumann. 

 Regular, Weiss & Rose. 

 Cubic, Dufrenoy & Miller. 

 Monometric, Dana (early 

 editions.) 



II. Tetragonal. 

 Pyramidal, Mohs. 

 Zwei-und-einaxigt , Weiss. 

 Tetragonal, Naumann. 

 Monodimetric, I lausmann. 

 Quadratic, vjn Kobell. 

 /?////<?/> ?V", Dana (early editions) 



III. Hexagonal. 



Rhombohcdral, Mohs. 

 Drt i-und-einaz ige, Weiss. 

 Hexagonal, Naumann. 

 Monotrimelrit , Hausmann. 

 NO'J E. This System liasa Kin >M- 



bohedral division, which 

 includes forms with only 3 

 planes of symmetry. 



IV. Ok 1 11 RHOMBIC. - 



Prismatic or Orthotype, Mohs. 



Ein-unif-i inaxige, Weiss. 



Rhombi, and Anisoinetric, 

 Naumann. 



Trimetric and Orthorhombic , 

 J lausmann. 



Trimetric, Dana, (early edi- 

 tions.) 



V. MONOCl INIC 



ffemiprismalic and ffemior- 



thotype, Mohs. 

 Zwk i-und-eingliederige, Weiss. 

 Monoclinohi dial, Naumann. 

 Clino hombic, von Kobell. 

 Hausmann, Des Cloiszeaux. 

 Augilic, I laidinger. 



,.7. , Miller. 

 Mouosynimetric, Groth. 



\ 1- J u I< 1 [NIC. 



'/', tar 10 prismatic, Mohs. 

 Ein-tmd-eingliederige, Weiss. 

 Triclinohedral, Naumann. 

 Clinorhomboidal, von K 

 Anot thic, Haidinger, Miller, 



& 1 >es Cloiszeaux. 

 I ymmet'ir, < Jroth. 



Axi s. 



Three, of equal length, 

 intersecting each 

 other at right angles. 



Three, intersectine each 

 other at right angles. 

 The lateral ones 

 equal in length ; the 

 vertical a varying one 



Planes of 

 Symmetry. 



Nint 



Four, the three equal 

 lateral ones inter- 

 secting at angles of 

 60 and the vertical 

 one, at right angles 

 to these, varying in 

 length. 



Three, of u n eq u a 1 



length, intersecting 

 each other at right 

 angles. 



Three, of unequal 

 length, two inter 

 secting at righl 

 angles and the third 

 intersecting one 01 

 the others obliquely. 



Three, of u n e q u a 1 

 length, all the in- 

 tersections oblique. 



Five. 



IIfx. proper. 

 S e v e 11 ; 3 

 at 60 J ; one 

 normal to 

 these; three 

 auxilia ry. 

 Rhom.Div 

 T h r e e a I 

 120". 



Examples. 



Fluor Spar. 

 Galena. 



I'yrite. 



Zircon. 



Vesuvianite. 



Cassiterite. 



Oalcite. 

 Quartz. 



Apatite. 



Three, at right Barite. 



angles to 

 each other. 



One. 



None 



Topaz. 

 Aragonite. 



Augite. 



Gy] sum. 

 Orlhoclase. 



Anorthite. 



Albite. 



Cyanite. 





