crocoite

{{Infobox mineral | name = Crocoite | category = Chromate minerals | boxwidth = | boxbgcolor = | image = Crocoite from the Dundas extended mine, Dundas, Tasmania, Australia.jpg | imagesize = 260px | caption = Crocoite from Dundas, Tasmania | formula = Lead Chromate PbCrO4 | IMAsymbol=Crc | molweight = | strunz = 7.FA.20 | system = Monoclinic | class = Prismatic (2/m)(same H-M symbol) | symmetry = P21/n | unit cell = a = 7.12 Å, b = 7.421 Å,c = 6.8 Å; β = 102.41°; Z = 4 | color = Orange, red, yellow; orange-red in transmitted light. | habit = Coarsely crystalline to acicular | twinning = | cleavage = Distinct on {110} indistinct on {001} and {100} | fracture = Conchoidal to uneven | tenacity = Sectile | mohs = 2.5–3 | luster = Adamantine, Sub-Adamantine, Sub-Vitreous, Resinous, Waxy | refractive = nα = 2.290(2) nβ = 2.360(2) nγ = 2.660(2) | opticalprop = Biaxial (+) | birefringence = δ = 0.370 | pleochroism = Weak | streak = Yellowish orange | gravity = 5.9–6.1 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent to translucent | other = | references = }}

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.