The wide variety of hypothetically possible two-repeat chains is discussed and results of cndo/2 MO calculations on isolated H8Si3O10 clusters modeling these chains are presented. Calculations indicate that within the wide spectrum of possible chains a rather restricted range of conformations is energetically favored. Despite the neglect of M-cations between the chains, calculated conformations of minimum energy compare favorably with observed conformations. The chain of lowest calculated energy is similar to that found in Na2SiO3. Chains with conformations intermediate to Na2SiO3 and a straight pyroxene chain are predicted to be favored over other conformations. This is in agreement with observed two-repeat chain structures.

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