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silicon atoms of cryptohalite, ?-(NH₄)₂SiF₆ (alpha), have cubic close(st) packing (CCP). A third form (gamma, ?) of (NH₄)₂SiF₆ uses hexagonal close(st) packing (HCP). Bararite, ?-(NH₄)₂SiF₆, utilizes (HP) packing. Layers with distorted octahedral gaps separate those with the anions. The (NH₄)⁺ ions

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