- Crystal system: No information. Shape suggests hexagonal, but it can be caused by twining.
- Crystal shape: Apparently, flattened hexagonal bipyramid.
- Stability on air: Not stable, deliquescent. Quickly absorbs moisture from air, becoming liquid.
Dissolve calcium nitrate (sometimes salt as fertilizer, in the form of hydrate Ca(NO3)·4H2O), and ammonium nitrate NH4NO3 (also fertilizer) in 5:1 molar ratio in minimal amount of hot water, then crystallize.
Left on open air, solution of this compound will not evaporate.
I used home-made dessicator for growing: big capped plastic container with 50g of anhydrous CuSO4 on the bottom.
Moderately toxic, as all nitrates.