28 Foote and Bradley — Solid Solution in Minerals. 



The composition of nephelite was further investigated the 

 following year by Morozewiez,* who also gives an excellent 

 review of the literature on the subject. The author gives 

 analyses of six different nephelites which were apparently 

 made with the greatest care on carefully purified material. 

 By his method of analysis, he was able to free his material 

 from even a trace of albite. The results and the ratios 

 derived are given below. 



Table II. 



Analyses of Nephelite (Morozewicz). 



II 



Nephelite (Elaeolite) from Mariupol. 

 Porphyritic Crystals. 



Ratio 



Si0 2 43'65 



Ti0 2 -10 



A1 2 3 .. 33-12 



Fe 2 3 0-48 



CaO 0-49 



K„0 5-69 



Na 2 15-91 



H„0 0-74 



2-21 



1-00 



0-99 



III 

 Nephelite (Elueolite) from Mariupol. 

 Coarse and granular. 



.Ratio 



Si0 2 43-46 



TiO, -07 



A1 2 3 .. 32-82 



Fe 2 O a 0-75 



CaO 0-31 



K 2 5-55 



Na„0 16-12 



H„0 0-89 



2-21 



1-00 



0-99 



100-18 



99-97 



IV 



Nephelite (Elseolite) Mariupol. 



Reddish Crystals. 



Ratio 



Si0 2 43-55) 



TiO, -03 \ l Ji 



A1 2 3 32-96 ( 



Fe 2 3 0-66 [ 1 UU 



CaO 0-25 ) 



K n O 6-09 [• 1-00. 



Na 2 16-00 ) 



HO. 0-33 



Nephelite (Elseolite) from Miask. 



Si0 2 ._ 42-71 



Ti0 2 0-04 



Al 2 O s 33-83 



Fe 2 3 0-40 



CaO.. 0-32 



K 2 0... 5-86 



Na 2 16-46 



H„0 0-18 



MgO trace 



Impurities .. 0-06 



99-86 99-86 



*Bull. Acad. Sciences Cracovie, 958, 1907. 



Eatio 

 2-12 



1-00 



1-00 



