| Molybdenum never occurs as the free element in nature, but is most commonly found in the minerals molybdenite and wulfenite. |
| When it rises through fractures in the surrounding solid rocks, these metals are precipitated, normally as the minerals chalcopyrite, bornite, and molybdenite. |
| Wulfenite is rather common in the upper oxidized zone of deposits which contain lead minerals and molybdenite. |
| The researchers have revealed that molybdenite, or MoS2, is a very effective semiconductor. |
| Arsenopyrite, cassiterite, molybdenite, wolframite, uraninite, and several of the common sulfides have all been observed at various locations. |
| The central potassic core normally contains low-grade mineralization consisting of minor chalcopyrite, molybdenite, and pyrite. |
