Millerite, Stilpnomelane

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A CLASSIC, OLD-TIME New York specimen from the historic Sterling Iron Mine at Antwerp. Brassy millerite microcrystals and black, bladed stilpnomelane microcrystals RICHLY cover both sides of this two-sided specimen. The highlight is a 6 mm spray of brassy millerite needles. Stilpnomelane is an uncommon layered silicate, related to mica and chlorite group minerals and this is a very highly representative specimen, with nice association. This old mine closed in 1910. Ex. Cilen and Elling Collections.