Dioptase

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Source volume: 54, issue: 2, PDF page: 45. Label: Figure 47. Dioptase crystals on matrix, about 8 cm, from Altyn-Tyube. Ex collection of Archduke Stephan Franz Viktor von Habsburg-Lothringen (1817–1867), one of the most famous of all Austro-Hungarian mineral collectors. ex collection of Humboldt University in Berlin, now in the collection of Gail and Jim Spann; Olga Kaspera photo (Crystal Classics). See the elegant label for this specimen in Figure 30.