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Source volume: 50, issue: 6, PDF page: 80. Label: Figure 39. Orange trona crystals with white thenardite, 11 cm, from old, buried evaporite layers in the neighborhood of Zug Lake, Wadi Natrun. Collection of the authors; Roberto Appiani photo.
Wadi El-Natrun Depression, Egypt: a premier evaporite locality yielding trona, halite, thenardite and related salts; prized for delicate, architectural crystal…
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