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Prabornaz mine, Italy
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Romeite and Piemontite, Prabornaz mine, St Marcel, Piedmont, Italy. Specimen 5.5x4.5x2.5cm, a mixture of two minerals typical of this mine. The purplish-black piémontite is a complex sorosilicate and the brown streaky romeite is a complex fluoro hydroxy oxy. Three handwritten historical labels, including Deyrolle and Chervet.