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Millerite: NiS
Comments: Dense tuft of hair-like millerite crystals. Location: Kerr-Addison mine, Timmons, Ontario, Canada. Scale: Tuft height 5 cm. © Dave Barthelmy
Comments: Fragile, acicular crystals of metallic yellow millerite in a vug. Location: Hall's Gap, Lincoln County, Kentucky, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals