NEWAANALCITE ROCK FROM LAKE, SUPERIOR 435 
I II III 
SHG) Dees 52.73 51.04 45.59 
AOS - - 29 1.32 
ZrOg - > 03 
INO - - 20.05 20.47 12.98 
Fe,Og, - 2 : 3-43 1.89 4.97 
FeO - -99 2.19 4.70 
MnO =- - 14 
CaO - - 3.35 2.62 11.09 
SrO i073 
BaO - sate 7 
MgO - - - - - ay. 907 8.36 
IONE - - - - 4.77 3°52 1.04 
Na,O - - - - - 7.94 11.62 4.53 
H.O (at 100°) - . - .69 ? 8 a 
H,O (atredheat)- - - 4.85 \ 5-85 3.40 
P.O; - - - - trace 27 QI 
Cl - 05 
COF- - - -93 62 
100.01 101.35 99.87 
Spec. Grav. - - - - 2.466 2.46 
silica, alumina, lime, and soda nearly in the proportions required 
for labradorite (Ab. 2: An. 3), though the lime and soda are 
about one third in excess of the amount required, the excess 
being less than I per cent., however. 
Summing up the results arrived at, the minerals forming the 
rock have the following percentages : 
Analcite - - - - - - - 47.00 
Orthoclase - - - - - - 28.24 
Labradorite - - - - - - 13.00 
Aegyrite - - - - - - 4.04 
Limonite - - - - - = | Aa5o 
Calcite - - - - - . 1.96 
97-83 
In this computation moisture removed at 100°, unimportant 
percentages of magnesium and barium oxides, etc., amounting 
in all to 1.47 per cent., have been neglected. 
The composition of the rock as shown by the analysis differs 
widely from that of analcite-basalt, as may be seen from a com- 
