A mineral consisting of lead molybdate, PbMoO₄. Wulfenite occurs commonly in yellow, orange, red, and grayish-white crystals. They may be tetragonal, tabular (see illus.), or pyramidal, with a luster from adamantine to resinous. Wulfenite may also be massive or granular. Its fracture is uneven. Its hardness is 2.7–3 and its specific gravity 6.5–7. Its streak is white. It is easily fusible and is decomposed by hydrochloric or nitric acid with the separation of molybdic oxide.