Crocoite
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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. Wikipedia
Color: Orange, red, yellow; orange-red in transmitted light
Chemical formula: PbCrO4
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal habit: Coarsely crystalline to acicular
Crystal system: Monoclinic
Formula (repeating unit): Lead Chromate PbCrO4
Luster: Adamantine, Sub-Adamantine, Sub-Vitreous, Resinous, Waxy
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