1 92 1. No. 



0\ THE F.CLOGITES OF NORWAY, 



33 



The chemical composition may be calculated as follows : 



Jadeite 34-82 



Aegirite 12.00 



Pseudojadeite 10.47 



Diopside 40-77 



Unaccounted for 2.06 



This pyroxene is a typical representative of the mixtures of diopside, 

 Jadeite and aegirite called chloromelanite. We quote, for comparison, 

 a few analyses of chloromelanite and chloromelanitite, a rock composed 

 chiefl}' of chloromelanite. I. Chloromelanite from St Marcel, Piedmont 

 (S. L. Penfield, Am. J. Sc. 46, 292, 1893 1. II. Chloromelanitite from Le Sinette, 

 Mocchie, \'al de Susa, Piedmont (S. Franchi, Boll. Com. geol. d'lt. 1900, 

 n:o 2, p. 1 43 1. III. Chloromelanitite from St Marcel, Piedmont (Damour, 

 quoted in Zfi. Kr. 6, 291). I\'. Chloromelanite from Vanelvsdalen. 



Vid.-Selsk. Skr. I. M.-X. Kl. 1921. Xo. I 



