Calcite, Dioptase

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Source volume: 54, issue: 2, PDF page: 41. Label: Figure 42. Dioptase-lined crystal pockets in situ, 20 to 30 cm across, in limestone with white calcite; mined at Altyn-Tyube during 2010 and 2011. The black oxide coating (tenorite?) on the crystals was easily removed with acid. Graham Sutton photos.