Geology Reference
In-Depth Information
8.3
Calculate the site occupancies of the mineral
analyses in Table 8.5, matching your results with the
ideal formulae given (cf. Tables 8.3 and 8.4). Carry
out all calculations to 4 decimal places.
8.4
Plot the pyroxene composition (Exercise 8.3) in a
ternary diagram whose apexes represent Ca, Mg
and (Fe
2+
+ Fe
3+
+ Mn). The plotting method was
described in Box 2.7. Plot the ideal compositions
of diopside, hedenbergite, enstatite and ferrosilite
(Fe
2
Si
2
O
6
).
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