(Ce; La; Ca)4 (Fe2+ ; Mg)2 (Ti; Fe3+ )3 Si4 O22 Chevkinite-(Ce) c 2001 ° Mineral Data Publishing, version...660(2) c = 11.280(3) X-ray Powder Pattern: Meade Co., Kansas, USA; some materials are metamict. 3.17 (100)...Ural Mountains, Russia. (2) Mohave Co., Arizona, USA. Polymorphism & Series: Dimorphous with perrierite...syenites; in air-fall ash deposits. Association: USA). Titanite, monazite, apatite, cronstedtite, quartz...Androngovato, and Ifasina, Ambato¯nandrahana. In the USA, in the Aquarius Mountains, Mohave Co., Arizona; |