molybdenite

A mineral form of molybdenum sulfide, MoS₂, that is the principal ore of molybdenum.

Sulphid of molybdenum, occurring in foliated masses or in scales, less often in hexagonal crystals, of a lead-gray color and metallic luster. It is very soft, and, like graphite, which it closely resembles, leaves a trace on paper.

A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum.

A mineral, molybdenum disulfide MoS2, that is the principal ore of molybdenum; it is structurally similar to graphite and has a similar look and feel.

a mineral resembling graphite that is valued as the chief source of molybdenum and its compounds