172 
occurring offers nothing of special interest. Schizolite is 
found in several rock-specimens from Kangerdluarsuk and 
Tugtup Agtakörfia. This mineral is in colourless crystals less 
than one millimeter long. It is more idiomorphic than the 
arfvedsonite and less idiomorphic than the felspar. It has been 
identified by the following observations. The crystals are of 
prismatic habit and without terminations. There are two distinct 
cleavages parallel to the direction of elongation of the crystals, 
and the axis of minimum optic elasticity ¢ coincides with (or 
is very near to) the intersection of the cleavages. In cross- 
sections the angle between the cleavage-traces is found to be 
about 85°. The bisectrix a lies in the obtuse angle between 
the cleavage-planes and is 15° or 20° from one of them. The 
(-axis is acute bisectrix, and the apparent optic axial angle is 
about 90°. All these characters agree with those of the 
schizolite!. — Ainigmatite is very rarely seen in the arfved- 
sonite-lujavrite; it is in short prisms. More frequently minute 
crystals of an unknown, deep brownish red mineral are found; 
this is strongly pleochroic and bears some resemblance to the 
rhönite of Sorser? but it differs in the absorption-tints. — 
Erikite has been observed in specimens of arfvedsonite-lujavrite 
from South Siorarsuit. This substance as described by Bécerp ® 
occurs in large weil-defined crystals in the pegmatite veins of 
the arfvedsonite-lujavrite in several places near Nunarsuatsiak. 
In thin slices it is seen to be a pseudomorph consisting of an 
intergrowth of a yellow mineral in minute grains and a zeolite 
(hydronephelite). In the rock-slices from S. Siorarsuit the 
erikile-crystals only attain half a millimeter in diameter but 
their micro-structure is identicai with that of the large crystals. 
The yellow mineral of these pseudomorphs resembles monazite, 
1 0. В. Boccizp, On some minerals etc. (Erikite and Schizolite). Meddelel- 
ser om Grønland XXVI. р. 121 (1903). 
> Neues Jahrbuch für Mineralogie,Beilage-Band XXIV, 1907, р. 475. 
5 Meddelelser om Grønland XXVI, р. 93 (1881). 
