4.179 g/cm³ (anhydrous)
3.25 g/cm³ (dihydrate)

white rhombohedral crystals

698°C

57.5 g/100 mL (0 °C)
74.2 g/100 mL (25 °C)
96.9 g/100 mL (100 °C) in water

slightly soluble in ammonia
insoluble in alcohol, acid

YO7875000