anions are especially important in how ammonium salts change phase.

Physical properties

Bararite forms tabular crystals. They are flattened, sometimes elongated, on {0001} (perpendicular to c). Christie reported tiny, transparent crystals of bararite that looked like paddlewheels and darts. Each had four barbs at 90°. The crystals reached up to 1 mm long, the barbs up to 0.2 mm wide. They were interpenetration twins,

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