mendipite

{{Infobox mineral | name = Mendipite | category = Halide mineral | boxwidth = | boxbgcolor = | image = Mendipite-160217.jpg | imagesize = 220px | caption = | formula = Pb3Cl2O2 | IMAsymbol = Mdi | molweight = 724.50 g/mol | strunz = 3.DC.70 Oxyhalide | dana = 10.3.1.1 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pnma or P212121, | unit cell = a = 9.52 Å, b = 11.87 Å, c = 5.87 Å; Z = 4 | color = Colorless to white, brownish cream, grey, yellowish, pink, red, or blue; nearly colorless in transmitted light. | habit = Columnar or fibrous aggregates, often radiated, and cleavable masses. | twinning = | cleavage = Perfect on {110}, fair on {100} and {010} | fracture = Conchoidal to uneven | tenacity = | mohs = to 3 | luster = Pearly to silky on cleavages; resinous to adamantine on fractures. | refractive = nα = 2.240, nβ = 2.270, nγ = 2.310 | opticalprop = Biaxial (+) | birefringence = δ = 0.070 | pleochroism = | 2V = Measured: 90°, calculated: 84° | streak = White | gravity = 7.24 | melt = | fusibility = | diagnostic = | solubility = Soluble in dilute nitric acid, HNO3 | diaphaneity = Translucent, rarely transparent | other = | references = }}

Mendipite is a rare mineral that was named for the locality where it is found, the Mendip Hills in Somerset, England. It is an oxyhalide of lead with formula Pb3Cl2O2.