74 
Addendum. Whilst the above was being* written analyses of 
the clean staurolite and of the staurolite-bearing rock from Mogum- 
ber were in progress. These were subsequently completed with the 
following results : — 
Staurolite. 
Staurolite 
Schist. 
0/ 
0 / 
Sif) 2 
... 2912 
40-81 
A 1 2 ()o 
52-47 
30 • 09 
Fe 2 0 3 
9 
4-37 
Pet) 
13-89 
5-86 
MnO 
•22 
•10 
M<r(> 
2-64 
5-52 
CaO 
•18 
•15 
Na 2 () 
•88 
k 2 0 
0-58 
■H„0 — 

•09 
H a O+ 
1-46 
3-98 
TiO, 
•82 
•90 
1 
• • ■ • • • 
•08 
s 
... 
Nil 
100-80 
100-01 
Sp. gr.... 
3-76 
2-91 
Two kilograms of the rock were sampled down for the rock 
analysis, and a clean crystal free from inclusions and weighing 8.3 
grams was taken for the mineral analysis. Neither Grubenmann, 
Zirkel nor Clarke gives any analysis of a staurolite schist with which 
to compare the figures for the Mogumber rock. 
Plate X. — Diagram illustrating the 
physical conditions conducive to 
the formation of the Proclilorite 
Ahnandine Series. 
