pascoite

{{Infobox mineral | name = Pascoite | boxwidth = | boxbgcolor = | image = Pascoite-001.JPG | imagesize = 240px | alt = | caption = Pascoite from D-day N. 2 mine, Utah, U.S. | category = Vanadate minerals | formula = Ca3V10O28·17 H2O | IMAsymbol = Pas | molweight = | strunz = 4.HC.05 | dana = 47.2.1.1 | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = C2/m | unit cell = a = 16.834 Å, b = 10.156 Å, c = 10.921 Å, β = 93.13°; Z = 2 | color = | colour = | habit = | twinning = | cleavage = Distinct on {010} | fracture = Conchoidal | tenacity = | mohs = 2.5 | luster = Sub-Adamantine, Vitreous | streak = Cadmium-yellow | diaphaneity = Translucent | gravity = | density = 2.455 (measured) | polish = | opticalprop = Biaxial (-) | refractive = nα = 1.775nβ = 1.815nγ = 1.825 | birefringence = δ = 0.050 | pleochroism = Visible | 2V = 50° to 56° (measured) | dispersion = r 3V10O28·17H2O that is red-orange to yellow in color. It was discovered in the Pasco Province of Peru, for which it is named, and described in 1914.

==Description== thumb|left|Pascoite from the Gypsum Valley District, San Miguel County, Colorado, United States Crystals of pascoite, which occur in granular crusts, are minute and lath-like with oblique terminations. The mineral is dark red-orange to yellow-orange in color and dirty yellow when partially dehydrated. It occurs as efflorescences in mine tunnels or as a product leached out of surficial vanadium oxides by ground water. Pascoite has been found in association with carnotite.