Clino-ferrosilite at P and T
Using Sueno et al (1984) and Hugh-Jones et al (1994) data we plot a model
for the bonding changes that occur in clino-ferrosilite as a function
of temperature and pressure. The structure adopts C2/c symmetry at both high-pressure
and high-temperature and adopts P21/c symmetry at room conditions.
Note that the coordination number of the M2 cation (green sphere) changes from 4 at
high-T to 5 at room conditions to 6 at high-P.
