This makes nickeline a minor ore of nickel and commercially important is some localities. The sulfides are usually hydrothermal in origin, although nickeline is also found in basic igneous rocks such as gabbros. Although crystals of nickeline are very scarce, some formations of nickeline can be attractive and an interesting addition to someone's collection. Color is copper-red to pink. Luster is metallic.
Crystals are opaque.
Crystal Habits are limited to mostly massive and granular components of massive hydrothermal sulfide rocks and gabbros, but a few localities have produced good pyramidal or tabular crystals. Columnar and reniform habits are also seen. Rare fourling twins are also seen. Dark brown to black. Upon heating a garlic odor maybe observed due to the arsenic content.