139 



By this transformation the schizohte gets the elements: 



a:b:c = 1-08620 : 1 : 0-70407 



a = 100° 19', ß = 99° 15', y = 83° 27'. 



a:c = {lOO} : {OOl} = 98° I5V2' 



so that it will be seen that the resemblance between the schi- 

 zohte on one side, and rhodonite and pyroxene on the other 

 is exceedingly slight. Consequently the schizolite must natur- 

 ally be arranged in the way first stated. 



Thus the entering of Mn in the chemical composition has 

 been of very different effect in the two minerals schizolite and 

 rhodonite, in comparison with the minerals free of manganese, 

 pectolite and wollastonite. The comparatively small amount ol 

 Mn found in schizolite has caused the mineral to be triclinic, 

 while otherwise in most crystallographic and optical respects 

 it has retained a great resemblance to pectolite. On the other 

 hand the complete replacing of Ga by il/w, which, with regard 

 to the chemical composition, makes the difference between 

 rhodonite and wollastotiite, has caused a complete incongruity 

 in most respects between the two minerals. 



