Comment on the following observations (a) The pyroxenes CaMgSi 2 O 6 and CaFeSi 2 O 6 are isomorphous (b) The feldspar NaAlSi 3 O 8 may contain up to 10 of CaAl 2 Si 2 O 8 (c) The mineral spodumene, LiAlSi 2 O 6 , is isostructural with diopside, CaMgSi 2 O 6 , but when it is heated it is transforme...

a The observation that the pyroxenes CaMgSi2O6 and CaFeSi2O6 are isomorphous is significant in the context of mineralogy and crystallography Isomorphi ...

Comment on the following observations: (a) The pyroxenes CaMgSi 2 O 6 and CaFeSi 2 O 6

Question:

Comment on the following observations:

(a) The pyroxenes CaMgSi₂O₆ and CaFeSi₂O₆ are isomorphous;

(b) The feldspar NaAlSi₃O₈ may contain up to 10% of CaAl₂Si₂O₈;

(c) The mineral spodumene, LiAlSi₂O₆, is isostructural with diopside, CaMgSi₂O₆, but when it is heated it is transformed into a polymorph having the quartz structure with the Li⁺ ions in the interstices.

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