570 °C (anhydrous)
100 °C, decomp (tetrahydrate)

soluble in ammonia
very slightly soluble in ethanol, acetone
insoluble in nitric acid

anhydrous:
71 g/100 mL (18 °C)
66 g/100 mL (20 °C)

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tetrahydrate:
60.43 g/100 mL (0 °C)
206.5 g/100 mL (100 °C) in water

white granular solid

2.986 g/cm³ (anhydrous)
2.20 g/cm³ (tetrahydrate)

Non-flammable

645 °C, decomp

Not listed

Irritant

2750 mg/kg (rat, oral)