Where's the better Nickel

Where's the better Nickel? For this kind of article many people do not know, xiamen is to its introduction:

Nickel, which is similar to silver white, hard and malleable and has ferromagnetic metal elements, which can be highly polished and corroded. Nickel belongs to the pro-iron element. The highest nickel in the core is the natural nickel alloy. In the earth's crust, iron-magnesium rocks contain more nickel than sialic rocks, such as peridotite with nickel granite, and the gabbro contains 80 times as much nickel as granite.