manganese mining look

  • Sugilite Value, Price, and Jewelry Information ...

    In 1975, a core-drill sample from a manganese mine near Hotazel, South Africa revealed a thin seam of sugilite. This material had enough manganese content to give it a deep purple color. Small but significant, the deposit became the first source of gem-quality sugilite and launched the gem's now famous association with purple.

  • Rhodochrosite: Manganese ore, gemstone, mineral specimen

    Rhodochrosite has a variable chemical composition. It is a manganese carbonate, but the manganese is frequently replaced by iron, magnesium and/or calcium as shown in this formula: (Mn,Fe,Mg,Ca)CO 3. These substitutions of other elements for manganese change the composition and alter the specific gravity, hardness, and color of the mineral. The ...

  • Manganese - Video Learning - YouTubeClick to view on Bing2:20

    Sep 08, 2015 · "Manganese" is a chemical element with symbol "Mn" and atomic number 25. It is not found as a free element in nature; it is often found in combination with iron, and in many minerals.