Calcite twin, 17.7 cm, from the Empire State No. 4 mine, Balmat, St. Lawrence County, New York. Ex Robert “Rocko” Rosenblatt specimen; László Kupi photo.
A collector's guide to Empire State No. 4 Mine, USA: its geology, mining history and notable minerals, illustrated with the 90 specimens documented from this locality on EarthWonders.
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