Jameson says, this mineral occurs in veins in secondary Porphyry, in the Manganese formation of Oehrenstok near Ilmenaa in Thuringia, my specimen is said to be from Elgersburg near Gotha, and is accompanied by purple Fluor. Exotic Mineralogy,: Or, Coloured Figures of Foreign Minerals, as a ... - Pagina 140 di James Sowerby - 1817 - 351 pagine Visualizzazione completa -
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