Siderite-rich Dolomite forms a rounded platy matrix almost entirely encrusted on all faces with colourless and glassy spherical clusters of Willemite to about 2 mm. From the Tsumeb mine, the Willemite coating is thicker on one side, giving a more creamy appearance. The Willemite fluoresces a dull mustard-yellow in SWUV and pale ghostly-white in LWUV. A great colourless Willemite from Tsumeb in Namibia.
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