ordoñezite

{{infobox mineral | name= Ordóñezite | image = Ordoñezite natural history museum.JPG | imagesize = | alt = | caption = | category = Antimonate mineral | formula = ZnSb2O6 | IMAsymbol = Ord | molweight = | strunz = 4.DB.10 | dana = | system = Tetragonal | class = Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m) | symmetry = P42/mnm | unit cell = a = 4.66 Å, c = 9.26 Å; Z = 2 | color = Very light to very dark brown, colorless to pearl-gray, light yellowish olive to dark olive | colour = | habit = Pyramidal crystals in drusy or stalactitic masses | twinning = Common on {013} | cleavage = | fracture = Conchoidal | tenacity = | mohs = 6.5 | luster = Adamantine | streak = | diaphaneity = Semitransparent | gravity = 6.635 | density = | polish = | opticalprop = Uniaxial (+) | refractive = N(calculated) = 2.02 - 2.04 | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }} Ordoñezite or ordóñezite is a rare tetragonal zinc antimonate mineral with chemical formula: ZnSb2O6.

==Discovery== Ordóñezite was first discovered and documented by Ezequiel Ordóñez (1867–1950), a Mexican geologist, formerly director of the Geological Institute of Mexico. It was first described in 1953 for an occurrence with cassiterite in veins in rhyolite in the Santín mine which is located about eight kilometres from Santa Catarina, Guanajuato, Mexico. Another locality is El Antimonio, southwest of Agua Prieta, Sonora, Mexico.