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sal ammoniac, and sulfur). Due to thermal motion, atomic behavior of ammonium salts can be very hard to evaluate. The anions, however, are ordered and have no unusual motion from heat.

A third form of (NH₄)₂SiF₆ was discovered in 2001 and identified with the 6mm symmetry (hexagonal). In all three arrangements, the (SiF₆)^2- octahedra

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