The name corresponding to this formula is "potassium manganite".

The reaction of cyclohexane with alkaline potassium permanganate is oxidation. This oxidation gives off the chemical cis-1,2-cyclohenanediol. The permanganate ion is reduced to green manganite.

includes the following ores: chromite, chromium, cobalt, columbite, ferberite, huebnerite, manganese, manganite, molybdenite, molybdenum, molybdite, nickel, psilomelane, pyrolusite, rhodochrosite, scheelite, tantalite, tantalum, tungsten.

There are many shiny black minerals, eg. hematite, uvite, columbite, magnetite, manganite, etc.

Perhaps you are thinking of obsidian or jet. Both are used in jewelry, though neither are actually minerals.

Almost every country, has a natural resource. Nova Scotia has many natural resources this includes oil, natural gas, manganite, and fish.