Discussion
Pyroxenes such as augite have a structure of
Answer: D
Correct answer: single chains of tetrahedra
Pyroxenes are single-chain silicates, each tetrahedron sharing two oxygens with its neighbours along the chain. The chains are bonded to one another more weakly than within themselves, which gives the two cleavages at close to ninety degrees that distinguish augite from hornblende in hand specimen.
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