Till-; MONOCLINIC SYSTEM 

 Forms 



125 



The nr\v forms would be: 



1. Kitfht and left plus and minus hrmipymmids, of two faces 

 , (hkl), (hkl), (hkl), (hkl), Fig. 247. 



Fia. 247. The Right 

 Plus and Minus 

 Hemipyramids. 



FIG. 248. Right Hemi- 

 prism. 



FIG. 249. The Right 

 Hemiclinodome. 



II. Right and left hemiprisms of two faces each, (hko), (hko), 

 Fig. 248. . 



III. Right and left hemiclinodome of two faces each, (ohk), 

 (ohk), Fig. 249. 



IV. Right and left clinopinacoid, 

 (010), (OlO). 



The orthodome and the ortho and 

 basal pinacoids are not modified, and 

 combine with the above new forms on 

 crystals of this type. 



Examples. A number of organic 

 compounds crystallize in this type, as, FIG. 250. Milk Sugar: <'<>m- 

 tart aric acid, C 2 H06. bination of b (OlO). b' (OlO). 



Fig. 250 is a combination of the right ^^(lo^ 

 and left clinopinacoids, right and left 

 prism, orthopinacoid and left clinodome on milk sugar. 



