... computer display. Physicochemical Properties: KNO3 is the rhombic system crystal powder or grain. Specific Density: 2.1109, Melting Point :333°C ... and Usages:: KNO3 is used raw material to make black powder, front line , blaze and some other things. In pottery and porcelain ... ,% ≥4646.1N,% ≥13.513.51Clarity TestQualifiedQualifiedApperanceClorless Crystal PowderClorless Crystal Powder Potassium Nitrate