Description: Millerite Deep Navitation Colliery, Treharris, Merthyr Tydfil, Wales, UK longest crystal 27mm Greenish, oxydised millerite sprays, with one crystal totally covered with elongated galena crystals, on siderite within an ironstone cavity. Siegenite crystal, 0.5mm to the left of the millerite. collected August 1995.

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