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Features:
Primary Mineral: Hematite (iridescent) Size: 4 x 1 inches (10.2 x 2.5 cm) Size Class: Cabinet Weight: 45 g (1.6 oz) Locality: Andrade Mine, João Monlevade, Minas Gerais, Brazil
Granular hematite with intense iridescence, from the Andrade Mine in Minas Gerais, Brazil. Rich green, blue, magenta and yellow-green colors run in broad, linear bands parallel to the length of the lath.
Dr. George Rossman studied this material and concluded the color is caused by a nanoscale mineral growing epitaxially on the hematite grains; it has not been named by the IMA because such a small phase is hard to characterize. Rock Currier imported a single container load in 1992, and the find was originally reported as Belo Horizonte to protect the mine. It was a one-time occurrence, because mining it disrupted the mine plan.
