PETERSITE-(Ce), Cu2+ Ce-6(PO4)(3)(OH)(6)center dot 3H(2)O, A NEW MIXITE GROUP MINERAL FROM YAVAPAI COUNTY, ARIZONA, USA

摘要

A new mineral, petersite-(Ce), ideally CU62+Ce(PO4)(3)(OH)(6)center dot 3H(2)O (IMA2014-002), has been found in the Cherry Creek District of Yavapai County, Arizona, USA. It is a secondary alteration mineral associated with malachite, chlorite, a biotite phase, quartz, albite, orthoclase, hematite, chalcopyrite, and an uncharacterized hisingerite-like mineral. Petersite-(Ce) occurs as sprays of yellowish-green, acicular crystals approximately 20X20X50 mu m in size. It has a white streak with vitreous luster. The mineral is brittle and has a Mohs hardness of similar to 3.5; no cleavage or parting was observed. The calculated density is 3.424 g/cm(3). An electron microprobe analysis resulted in an empirical chemical formula of Cu-6.05(Ce0.18Y0.16La0.12Nd0.09Gd0.03Pr0.02Dy0.01Sm0.01Ca0.42)Sigma(1.04)[(PO4)(2.54)(SiO4)(0.14)(PO3OH)(0.32)(OH)(6)]center dot 3.65H(2)O.