36 Sypney H. BALL: 
varies from 0.20 to 4.64 %; sulphur, from а trace to 2.82 %; and iron, 
usually make up over 95 % of the mass. 
The discovery of native iron in the basalt led to a most famous 
and protracted discussion, in which many of the most noted scientists 
of the last quarter of the Nineteenth Century participated. The first 
question was whether the iron was of meteoric or telluric origin, and 
later, when the telluric origin had been proven, discussion centered 
upon the source of the iron and its method of precipitation. 
That the iron was of the magma and was reduced to native form 
by the carbonaceous content of the Cretaceous beds traversed 13 altogether 
possible. The persistent association of graphite and native iron at first 
sight seems to support this hypothesis, although graphite (see р. 40—51) 
13 Common in many igneous rocks of Greenland. 
The presence of native шоп in similar flow rocks elsewhere in the 
world on the other hand, renders it equally possible that the native 
iron may have crystallized from magma without extraneous precipitant. 
In this connection Dr. Р. А. WAGNER’s experiment is interesting (“The 
Diamondfields of South Africa” 1914, р. 116—7). Не smelted in а 
graphite crucible kimberlit from Kleinzonderhout South Africa. Upon 
cooling he found а hypocrystalline aggregates consisting of опуше and 
titaniferous augite crystals and, а glass in which were scattered globules 
of native iron up to 1 gram in weight. This perlitic grey iron enclosed 
flakes of graphite. The iron was doubtless produced by the reducing 
action of graphite upon the magnetite and ilmenite of the powdered rock. 
Other iron occurrences. 
Magnetite, with the exception of felspar, quartz and biotite, is the 
most abundant constituent of the granite pegmatite of the west coast. 
of Greenland. The magnetite nodules are rarely over 5 cm (2 inches) 
in diameter, and the occurrence is only of scientific interest as an un- 
usually widespread and abundant occurrence of pegmatitic magnetite. 
Magnetite is also one of the minerals of pegmatites of the soda-rich 
rocks of the Julianehaab district. Ilmenite also occurs in small quantities 
in some of the granite pegmatites. 
In the Tertiary and Cretaceous sedimentary rocks of the Disco 
Island region, are thin lenticular beds of clayey or sandy iron carbonate. 
The iron carbonate lenses are particularly abundant in the sandstone 
beds, which predominate in the upper (Miocene) part of the sediments. 
These sedimentary iron ores are frequently notably fossiliferous, and 
from them many of the plants described by HEER were obtained. At 
Atanikerdluk Island, a limonite lense is reported to accompany the iron 
carbonates. 
