Comment on the following observations.
(a) the pyroxenes CaMgSi2O6 and CaFeSi2O6 are isomorphous;
(b) the feldspar NaAlSi3Os may contain up to 10% of CaAl2Si2O8;
(c) the mineral spoclumene, LiAlSi2O6, is iso- structural with diops ide, CaMgSi2O6, but when it is heated it is transformed into a polymorph having the quartz structure with the Li1 ions in the interstices.
Compound | vj(symmetric)/cm-1 | v3(asymmetric)/cm-1 |
I | 2330 | 2158 |
II | 658 | 1535 |
III | 1333 | 2349 |
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