mammothite

{{Infobox mineral | name = Mammothite | category = Sulfates | image = Mammothite.jpg | caption = Sky blue acicular crystals of mammothite in a specimen from the famous Lavrion deposit (Attica, Greece). | formula = Pb6Cu4AlSb5+O2(OH)16Cl4(SO4)2 | IMAsymbol = Mm | molweight = | strunz = 8th Edition, 6/B.10-50 | system = Monoclinic | class = 2-Sphenoidal | symmetry = C2 | unit cell = a = 18.93(3) Å, b = 7.33(1) Å c = 11.35(2) Å; β=112.44(10)°, Z = 2 | color = Cerulean blue, blue-green, pale blue | habit = Tabular to prismatic and acicular crystals, radial aggregates | twinning = | cleavage = Distinct on {010}, Good | fracture = Irregular, Uneven | tenacity = Brittle | mohs = 3 | luster = Sub-Vitreous, Resinous | polish = | refractive = nα= 1.868 nβ= 1.892 nγ= 1.928 | opticalprop = biaxial positive | birefringence = δ=0.060 | dispersion = r > v | pleochroism = Visible | fluorescence= | absorption = | streak = Pale blue | gravity = | density = 5.25 g/cm3 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent | other = | references = }}

Mammothite is a mineral found in the Mammoth mine in Tiger, Arizona and also in Laurium, Attika, Greece. This mineral was named in 1985 by Donald R. Peacor, Pete J. Dunn, G. Schnorrer-Köhler, and Richard A. Bideaux, for the Mammoth vein (one of the two main veins in the mine) and the town of Mammoth, Arizona, which was named for the mine. The mammothite that is found in Arizona exist as euhedral crystals imbedded in micro granular, white colored anglesite with a saccharoidal texture. The associated minerals include phosgenite, wulfenite, leadhillite and caledonite. In Greece, the mammothite exists as small euhedral crystals and also as microscopic rock cavities lined with projecting crystals within the slags. The associated minerals here are cerussite, phosgenite and matlockite. The ideal chemical formula for mammothite is Pb6Cu4AlSb5+O2(OH)16Cl4(SO4)2.