| At the Redskin mine, molybdenite is found in small cylindrical greisen pipes in the Redskin Granite. |
| At Azegour, Morocco, uraninite occurs in tactite with molybdenite, chalcopyrite, barite, pyrite, hematite, and garnet. |
| Willman reported astrophyllite, biotite, molybdenite, and riebeckite associated with smoky quartz and microcline on Mount Kineo at North Cheyenne Canyon. |
| Arsenopyrite, cassiterite, molybdenite, wolframite, uraninite, and several of the common sulfides have all been observed at various locations. |
| Molybdenum never occurs as the free element in nature, but is most commonly found in the minerals molybdenite and wulfenite. |
| Wulfenite is rather common in the upper oxidized zone of deposits which contain lead minerals and molybdenite. |
