Millerite
Millerite is a mineral form of nickel, composed of nickel sulfide (NiS). The whisker-like millerite crystals are on a background of hematite. This sample is on display at the Smithsonian Museum of Natural History. The image is close to actual size.
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This sample of millerite is about 4x4 cm and is from Hall's Gap, Kentucky. It shows the characteristic crystal whiskers.
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This sample of millerite is about 3x6 cm and is from Littfeld, Nord Rhein-Westphalen, Germany.
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This large sample of millerite resembles a mound of moss. It is about 13x20 cm and is from Neunkirchen, Nord Rhein-Westphalen, Germany. Closer examination reveals the crystal whiskers.
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