806 _ HENRY S. WASHINGTON 
ture of the anorthite molecule. The only colored component 
seen in the sections is a grass-green aegirite, but other ferro- 
magnesian minerals are probably present. The large crystals 
are well shaped, but have borders of detached aegirite grains 
which are embedded in the surrounding feldspar. These grains 
extinguish simultaneously with each other and with the large 
crystal, forming a sort of pegmatitic zone. The aegirite has 
been apparently cariously corroded by the magma and the hol- 
lows filled with feldspar substance. Nepheline occurs very 
sparingly in small interstitial spots. 
An analysis of this type yielded the results below, in I]: 
I II III IV 
SiO, - - = 637/11 63.09 64.54 O37/ 1 
TiO, - - trace 0.45 trace 0.86 
Usa = - Bit af cen 0.06 Bee Bente 
INO = - 18.30 18.50 18.13 16.59 
Kes Or - > | BOS) 2.90 2.63 2.92 
FeO - - Bl 1.36 0.97 0.66 
MnO - - =) trace trace kev 0.20 
MgO - - 0.09 0.16 0.67 0.90 
CaO = - S07 alice) 1.00 0.62 BiH 
BaO - - cosine eae 0.42 aes 
Na,O - - 2 6,26) 7.25 6.60 8.26 
K,O - - 6.21 5.23 5-99 2.79 
H,O(110°—) - 0.09 0.2 eats 
lala Ol(ii@?4=)) O17 0.62 0.31 0.19 
PaO = - Sa enegee seta trace 
TOOL | NCOSR WOO  — LOCLIT©) 
I Pulaskite (hedrumitic). Salem Neck. H.S. WASHINGTON anal. 
II Pulaskite. Salem Neck. H.S. WASHINGTON anal. 
III Pulaskite. Farrisvand. Broccrer. Erupt. gest. Krist. geb. III, 198. 18098. 
IV Umptekite. Bank of the Umpjaur. Kola Penin. Finland. ROSENBUSCH. 
Elemente d. Gesteinslehre. 1898, p. 112. No. 5. 
It is decidedly more acid than the normal type, carrying less 
alumina, a little more lime, and about the same amount of alka- 
lis. Itis evidently a rather acid syenite, but its real affinities 
are uncertain. It bears a resemblance to the umptekite which 
Ramsay observed on the borders of the nepheline-syenite of 
Kola, and it is of interest to note that Rosenbusch speaks of 
