It never occurs as a free element, but only in ores such as pyrolusite, manganite, psilomelane, and rhodochrosite. |
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Michele, by contrast, likes to work with tourmaline, agate druse, labradorite and psilomelane. |
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Mineralogical composition of the fines at Balaghat and Ukwa mines is similar in nature and consists of Hollandite, Braunite, Psilomelane, Hematite, Apatite and Quartz. |
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