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NEPHEI.INsBEARING PEGMATITIC DYKES ON SEILAND
It will be shown from the molecular ratios calculated that the per*
centage of A1203 is 0,43% too high.
The following table gives the analysis calculated to 100 with Fe203
and Ign. (— 0,25 %>) not considered:
Table 2.
Analysis of albite from Seiland calculated to 100.
Molecular ratios.
Si02 ....... 66,87 °/o 1,1072
A12Ö3 ...... 20,55 » 0,2011
Cab........ 1,04 » 0,0185
BaO........ 0,11 » 0,0007
SrO........ 0,11 » 0,0011
Na20....... 10,27 » 0,1654
K.,0....... 1,05 » 0,0111
0,1968
100,00 %
(RO + R20) : A1203 = 0,1968 : 0,2011.
Excess of A1203 is = 0,45 °/’o.
From these figures the percentage of the different feldspar compo*
nents constituting the albite is calculated and given in the following
table 3.
Table 3.
Calculated composition of the albite from Seiland.
Albite: Na A1 Si308 ... 87,11 °/o
Anorthite: Ca Al2 Si208. . . 5,16 »
Orthoclase: K A1 Si308 . . . . 6,20 »
Ba*feldspar: Ba Al2 Si208 . . . 0,26 »
Sr* -»- : Sr Al2 Si208 . . . 0,35 »
99,08 %
127
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