phoenicochroite

{{Infobox mineral | name = Phoenicochroite | boxwidth = | boxbgcolor = | image = Phoenicochroite-212833.jpg | imagesize = | alt = | caption = Deep red Phoenicochroite crystal, with orange-yellow schwartzembergite. San Francisco Mine, Tocopilla Province, Chile. Photo width 1.5 mm. | category = Sulfate (chromate) mineral | formula = Pb2O(CrO4) | IMAsymbol = Phc | molweight = | strunz = 7.FB.05 | dana = 35.1.2.1 Anhydrous chromates | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = C2/m | unit cell = a = 14 Å, b = 5.67 Å, c = 7.13 Å; β = 115.22°; Z = 4 | color = Dark red, bright red | colour = | habit = Tabular crystals; thin coatings, and massive | twinning = | cleavage = Perfect on {201} | fracture = | tenacity = Sectile | mohs = | luster = Adamantine, resinous | streak = Brick-red | diaphaneity = Translucent | gravity = 5.75, 7.01 | density = | polish = | opticalprop = Biaxial (+) | refractive = nα = 2.380, nβ = 2.440, nγ = 2.650 | birefringence = 0.270 (δ) | pleochroism = | 2V = 58° (measured) | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = Health risks: contains carcinogenic and mutagenic chromate ion | prop1 = | prop1text = | references = }}

Phoenicochroite, also known as melanochroite, is a lead chromate mineral with formula Pb2OCrO4. It forms striking orange red crystals. It was first discovered in 1839 in Beryozovskoye deposit, Urals, Russia. It is named from the Greek word φοίυικος for "deep red" and χρόα for "color", in allusion to its color.