708 HENRY S. WASHINGTON 
to grorudose, and the subrang is almost dopotassic through the 
very small amount of alumina present, II.3(4).1.(2)3. As this 
dopotassic subrang is as yet unknown, they may best be called 
grorudose-varingose. The others fall centrally in  grorudose, 
Tsar. 
It will have been noted that none of the pantellerites analyzed 
by me fall in the subrang pantellerose, II. 4.1.4. This name was 
chosen for the subrang because of two analyses by Foerstner, 
which were then the only ones available.‘ As we shall see, however, 
these must be considered to be incorrect, and this case may serve 
as an example of the danger of basing rock names depending on 
chemical characters on any but reliable analyses. Further examples 
will be found in a forthcoming second edition of my Collection of 
Rock Analyses. 
Mode.—The rock is so dominantly hyaline that the mode is 
indeterminate. It may be of interest to note, however, that if the 
lava had wholly crystallized the rocks would have had about the 
following composition: quartz 15 to 25, soda-microcline 45 to 55, 
cossyrite 15 to 25, aegirite or aegirite-augite 5 to 10. It is evident 
that a large proportion of the aegirite and cossyrite molecules 
would have been among the last to crystallize out. J. Soellner, 
through an analysis by Dittrich, has shown that the olivine from 
this type of pantellerite is an almost pure fayalite, with FeO: 
‘MgO=10:1. The analysis and the norm of the olivine-bearing 
pantellerite C confirm this, the ratio being 6:1. 
It seems to be preferable to use the name hyalopantellerite for 
this type rather than to coin a new name. If the latter be deemed 
advisable that of khagiarite might be suggested. 
BASALT (CAMPTONOSE) 
Occurrence.—Basalts, all of which belong to the subrang camp- 
tonose (IIT. 5.3.4), are found only in the northwest corner of the 
island, being the products of eruption of the last phase of the 
volcano. They poured out from small cones—Cuddie Ferle, 
Bruciate, Monti, Rossi, Nera, and through the pantellerite on the 
t Cf. H. S. Washington, Prof. Paper U.S.G.S. 14, 1903, p. 221. 
2 J. Soellner, Zeits. Kryst., XLIX (1911), 144. 
