Crocoite is a mineral consisting of lead chromate, PbCrO4, and crystallizing in the monoclinic crystal system. It is identical in composition with the artificial product chrome yellow used as a paint pigment.
Crocoite from Dundas, Tasmania
Specimen from the Red Lead Mine, Tasmania, Australia
Crocoite from Adelaide Mine, Dundas mineral field, Zeehan District, Tasmania, Australia
Crystal intergrowth
Lead(II) chromate is an inorganic compound with the chemical formula PbCrO4. It has a vivid yellow color and is generally insoluble. Two polymorphs of lead chromate are known, orthorhombic and the more stable monoclinic form. Monoclinic lead chromate is used in paints under the name chrome yellow, and many other names. It occurs also as the mineral crocoite.
Lead, Pb Chromium, Cr Oxygen, O
Image: C.I.77600
Lead chromate is used as the bright yellow pigment in Sunflowers, a painting by Vincent van Gogh.