From very early times nickel-bearing minerals, such as niccolite, were mixed with glass to create green glass.    From Wordnik.com.  [Nickel] Reference

He named the new metal nickel after the mineral name of niccolite.    From Wordnik.com.  [Nickel] Reference

When nickel was extracted from niccolite, the mineral name was a logical source of the name for the element, nickel.    From Wordnik.com.  [Nickel] Reference

In 1751, Axel Fredrik Cronstedt of Sweden attempted to extract copper from the mineral niccolite and to his surprise got a silvery-white metal, instead of the copper.    From Wordnik.com.  [Nickel] Reference

(particularly pentlandite, but also millerite, niccolite, and others), which are found at Sudbury intergrown with the iron and copper sulphides, pyrrhotite and chalcopyrite; and the hydrated nickel-magnesium silicates (garnierite and genthite), which are products of weathering.    From Wordnik.com.  [The Economic Aspect of Geology] Reference