800 HENRY S. WASHINGTON 
green hornblende is rare in these specimens and pyroxene seems 
to be entirely wanting. Magnetite, apatite and zircon are pres 
ent in small amount. Aegirite, spoken of by Sears as often 
present, was not seen by me. 
The specimens from Hospital Point and Salem Neck resem- 
ble these as far as the quartz and feldspars go, though these are 
finer in grain and microcline is more abundant. The biotite is 
also identical. A fresh, primary, greenish-gray pleochroic horn- 
blende is abundant. Both minerals are much corroded. Mag- 
netite and apatite are more abundant, zircon in about the same 
amount. These rocks are apparently transition forms toward a 
more basic variety, represented by specimens from Concord 
street, West Gloucester and from several points south of 
Shalers area. The latter are darker im color, due to) ereater 
abundance of biotite and hornblende. They are like those just 
described in thin section except that there is less quartz, and 
hornblende and biotite are more abundant, the former predomi- 
nating. While no plagioclase or nepheline was seen, they seem 
to be connecting phases with the diorites and essexites of the 
region near them. 
For the analysis representing these quartz-syenites a speci- 
men was chosen from the west end of Wolf Hill, northwest of 
Gloucester, which, although not far from the granite, was fresh 
and seemed to be representative of the rocks of Shaler’s area. 
For comparison is given an analysis of nordmarkite from 
Norway. 
I lI I II 
S1@p 2 ee OSG 64.02 CAO ow TG 1.00 
ADO} ot ana trace 0.62 BaO Sy yer bine Sanaa Gee 
MgOg = eS) 5 1G.58 17.92 Na,O Stas 3.97 6.67 
Fe,0,; Shs 0.90 0.96 epOW eS eager a, 8Mey 6.08 
FeO a soot, le MeO | 2.08 H,O(110° — ) - 0.18 coupes 
Win©) sos trace 0.23 IRgOUIRO ==) =) Oly ToS 
IYO) CS) So balls 0.59 
: WOOL HON.3i7/ 
I Nordmarkite, Wolf Hill, Gloucester. H.S. WASHINGTON anal. 
II Nordmarkite, Tonsenaas, North of Christiania. JANNASCH anal. BROGGER, 
Zeit. Kryst., Vol. XVI, p. 54, 1890. 
