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Crystal structure is a distorted rock-salt structure with the C22− units lying parallel to one another.
(a) The structure of CaC2 is based on the rock-salt structure but is elongated in the direction parallel to the axes of the C22− ions giving a tetragonal unit cell.
(b) The structure of FeS2 has S22− anions orientated in different directions producing a cubic unit cell based on the rock-salt structure type.
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