Dragon Minerals - Update January 28, 2019

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RF337: Siderite/Sphalerite epimorph after Calcite
Aggeneys, Namakwa District, Northern Cape, South Africa
Cabinet - 12.5 x 7.4 x 4.3 cm (4.9 x 2.9 x 1.7 inches)
Weight - 194 grams (0.43 pounds)
ex Roy Foerster collection
Specimen status: Sold

This specimen started as calcite crystals, which became coated with a brown siderite/sphalerite crust. The calcite then dissolved away, leaving a hollow crust but retaining the calcite shape. (We assume in this case the epimorphs are hollow, even though we cannot see inside. In every other example of this material I have seen in which the epimorph had a hole allowing one to peer inside, the calcite was gone. So we'll assume the same here as well.) The largest of these mineral oddities is 5.6 cm in size. No damage. Displays nicely. When this now-classic material was being produced, good specimens like this were not common, and consequently commanded high prices.

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