H. S. Washington — New Leucite Rock. 47 



12345678 



SiO, 5102 45-49 41-43 45-99 44-69 47-20 47-39 46-06 



A1 2 3 .... 22-21 17-66 9-80 16-56 14-57 17-66 14-79 1001 



Ee 2 3 .... 1-48 0-81 3-28 4-17 5-56 3-51 3-10 3-17 



Feb 0-57 1-45 5-15 5-38 3-69 4-50 5-08 5-61 



MgO 0-14 4-27 13-40 5-30 5-83 4-20 6-77 14-74 



CaO 2-31 16-72 16-62 10-47 11-68 9-52 11-61 10-55 



Na,0 .... 1-67 1-66 1-64 2-18 2-37 2-25 1-49 1-31 



K 2 17-94 11-44 7-40 8-97 8-62 7-63 6.93 5-14 



H 2 0± . . . 0-93 0-98 1-11 0-45 0-71* 1-29 105 0-73 



Ti0 2 0-57 0-13 0-29 0-37 103 1-19 1-41 0-73 



P 2 3 002 0-16 none 0-56 1-16 0-58 0-45 0-21 



MnO 001 trace n. d. n. d. 0-15 n. d. 0-27 trace 



Incl 1-10 003 0-25 0-23 0-27 0-60 



99-97 100-80 100-12 100-65 100-06 99-76 100-34 99-57 

 * H 2 0+ = 0-60, H 2 0— — 011. 



1. Italite, Kocca Monfina. Washington analyst. 



2. Vesbite, Monte Somma. Washington analyst. 



3. Venanzite, Pian di Celle, Umbria. Eosenbusch, Sb. Akad. Wiss. Berl., 

 1899, p. 110. 



4. Cecilite, Capo di Bove. Washington analyst. Kom. Com. Eegion, 

 p. 139. 



5. Cecilite, Laghetto, Alban Volcano. Washington analyst. Unpublished. 



6. Albanite, Arcioni, Alban Volcano. Washington, Eom. Com. Eegion, 

 p. 113. 



7. Albanite, Mte. Jugo, Bolsena Volcano. Washington analyst. Eom. 

 Com. Eegion, p. 124. 



8. Missourite, Highwood Mts., Montana. Hurlburt analyst. Pirsson, this 

 Journal, 2, 321, 1896. 



Cecelite is the old name of Cordier 18 for the melilitic 

 "leucitites," and is the name which it has been pro- 

 posed 19 to revive for these rocks. The name albanite 20 

 is proposed to replace the old name "leucitite," imply- 

 ing an effusive rock composed in approximately equal 

 parts of leucite and augite, with only accessory and negli- 

 gible amounts of plagioclase, melilite, olivine, magnetite, 

 etc. 



Geophysical Laboratory, 



Carnegie Institution of Washington, 

 April 17, 1920. 



18 Cordier, Description des Eoches, Paris, 1868, p. 117. Cf. C. E. VIII 

 Cong. Geol. Int., Paris, 1901, p. 1051. 



19 Washington, Eom. Com. Eegion, 1906, p 140. 



20 This name has been given to a " bituminous material from Albania ' ' 

 (Cf. L. J. Spencer, Min. Mag., 16, 352, 1913), but, in view of its application 

 to a mineral of very indefinite characters, it would seem to be allowable to 

 use it for a rock type. The root is already in use for the name, albanose, of 

 the subrang III. 8. 2. 2. 



