Zinc Cobalti-tri-nitrite, 2ZnO.Co₂O₃.3N₂O₃

Zinc Cobalti-tri-nitrite, 2ZnO.Co₂O₃.3N₂O₃.11H₂O, is obtained by double decomposition of red sodium cobalti-nitrite and zinc chloride solutions. On concentration over sulphuric acid at room temperature small crystals of the zinc salt are formed. These are deep red, almost black in colour, and probably belong to the monoclinic system.