24 
ing more or less white, vein-like material in the interlamellar spaces; No. 9, 
like No. 6, consists of bits chipped with a knife-point from slickensided 
faces. Nos. 6 and 9, therefore, are specimens in which the development 
of schist-making minerals has reached a maximum. 
The unsheared greenstone is composed entirely of secondary minerals, 
except for some remnants of the original feldspar. Examination of a num- 
ber of sections shows that carbonates form 25 to 50 per cent of the rock, 
and talc the bulk of the remainder. From 5 to 10 per cent of chlorite, 
2 or 3 per cent of quartz, and 1 or 2 per cent of leucoxene are the principal 
remaining constituents. 
The analyses were made by E. A. Thompson, chemist, Mines Branch, 
Department of Mines, Ottawa, and are as follows: 
— 
1 
2 
3 
4 
5 
6 
7 
8 
9 
SiO* 
57-80 
58*40 
58-20 
58-20 
62-S0 
55*10 
35*85 
43*55 
43-35 
AhOs. • . . - • 
16-12 
16*49 
17-30 
17-81 
17-42 
17-65 
6*58 
9*63 
7*59 
FeaQs. . 
1-28 
1*92 
4-42 
3-50 
3-40 
4-54 
0-84 
0-75 
0*58 
FeO,,, 
4-96 
4*67 
5*11 
5-95 
3*35 
6-02 
9*34 
9-93 
9*90 
PsO* . 
0 02 
0-03 
0-01 
0-02 
002 
Nil 
Nil 
Nil 
Nil 
TiOs 
0-49 
0*23 
0*74 
0-66 
0*33 
0-66 
Tr. 
Tr. 
Tr. 
MnO... 
Nil 
Nil 
Nil 
Nil 
Nil 
Nil 
Nil 
Nil 
Nil 
CaO . 
3-20 
1*65 
1*50 
0*80 
Nil 
0-40 
6-90 
3*40 
3*90 
MgO . . . . 
2-47 
2*76 
1*52 
1-85 
1-88 
1-92 
23-43 
22*67 
23*97 
NaaO... 
2-12 
2*69 
1-76 
1-38 
1-30 
1-09 
Tr. 
Tr. 
Tr. 
K*0 , . . . 
3-96 
3*23 
3*91 
3-66 
4-63 
4-39 
Tr. 
Tr. 
Tr. 
As...,. .... 
Nil 
Nil 
Nil 
Nil 
Nil 
Nil 
Nil 
Nil 
Nil 
COi 
3*00 
2*75 
1-40 
1-70 
1*10 
2-30 
11-10 
3-00 
3*40 
C. ....... 
0-76 
1*02 
1*31 
1-39 
1-25 
1-52 
0-04 
0 05 
0*14 
St 
1-13 
1*17 
1*31 
1-67 
1-00 
1-80 
0-11 
0-05 
0-14 
s*.. 
0-05 
0*04 
0*07 
0-11 
0-06 
0-05 
Nil 
Nil 
Nil 
SOi... ..... 
Nil 
Nil 
Nil 
Nil 
Nil 
0-45 
Nil 
Nil 
Nil 
HjO + 105° C.... ... 
2*40 
2*40 
1*60 
1-60 
1*81 
2-40 
5-82 
6*75 
7-20 
HsO - 105° C 
0*15 
0*50 
0-10 
0-05 
0*11 
0*09 
0*11 
0*25 
0*20 
99*91 
99-95 
100*26 
100-35 
100*46 
100*38 
100- 12 
100-03 
100-37 
S* in Pyrrho tite S 1 in Pyrite 
1. 0-05% S - 0-09% FeS-f S 
2. 0-04% S - 0-08% FeS+S 
3. 0-11% S = 0-21% FeS+S 
4. 0*07% S - 0*13% FeS+S 
5. 0 06% S = 0*11% FeS-fS 
6. 0-05% S = 0*09% FeS-f S 
1. 1*13% S = 2*11% FeS* = 1*40% FeaO, 
2. 1*17% S = 2*19% FeSa = 1-46% Fe 2 0, 
3. 1-67% S = 3*12% FeSa = 2-08% FeaO* 
4. 1*31% S = 2*45% FeS a = 1*63% FeaO* 
5. 1*00% S = 1*87% FeSa = 1-25% FeaOa 
6. 1-80% S = 3-37% FeSa = 2-24% FeaOa 
Notes: 
(1) Determination of carbon present as free carbon and in carbonates. 
i. Total carbon determined by ignition in a stream of oxygen. Carbonates decomposed 
with evolution of COs, and free carbon converted into GOa. Absorption in ascarite and 
weighed directly. 
ii. Free carbon. Portion of sample treated with HC1 to decompose carbonates. Residue 
containing free carbon ignited in oxygen as in (i) above, COi so found calculated to 
carbon. Difference between i and ii = carbon present in carbonates. 
(2) Determinations of sulphur. 
i. Total sulphur determined hy fusion with NaaCO* -f KNO3 extracting and precipitating 
as BaSO*. 
ii. Sulphur in pyrrhotite determined by distilling with HC1 (converting S into H 2 S) into 
CdCla solution and titrating with iodine. 
iii. Sulphur in pyrite = difference between i and ii. As a check, total sulphur present in 
sulphides determined by ignition of sample in oxygen by which S is converted into 
SOs. This is oxidized to SO, 3 and precipitated as RaSO-i. 
