Haynesite

General Information: Chemical Formula:(UO2)3(SeO3)2(OH)2·5(H2O) Composition:(Molecular Weight = 1,188.09 gm)Uranium 60.10 % U Hydrogen 1.02 % H Selenium 13.29 % SeOxygen 25.59 % O  Empirical Formula: (UO2)3(SeO3)2(OH)2·5(H2O) Environment:Found as crusts on mudstones and sandstones of the Morrison formation. IMA Status:Approved IMA Locality:Repete mine near Blanding, San Juan County, Utah. USA. Name Origin:Named for Patrick Haynes, U.S. Geologist who first collected the mineral.Physical Properties: Cleavage:[010] Good Color:brownish yellow or amber. Density:4.1 Diaphaniety:Transparent to Translucent Habits:Tabular - Form dimensions are thin in one direction., Acicular - Occurs as needle-like crystals., Rosette - Bundled tabular aggregates resembling rose flower petals. Hardness:1.5-2 - Talc-Gypsum Luminescence:Fluorescent, Short UV=yellowish green. Luster:Vitreous (Glassy) Streak:whiteMore details...