Where there is a better Nickel Chloride

Where there is a better Nickel Chloride? For many people this is a strange object, and here's the introduction to it:

Nickel chloride (II) is a chemical compound of NiCl2. Anhydrous nickel chloride as the yellow, but it is rare in nature, only in the water of nickel chloride stone such ore can be found that the more familiar is green two nickel chloride hexahydrate (NiCl2 · 6 h2o). Nickel chloride and a series of known hydrates are all green. In general, nickel chloride is the most important nickel source in chemical synthesis. Nickel salt is carcinogenic.