Allanite-(La), Bastnäsite-(La)
Mochalin Log, Kyshtym, Chelyabinsk Oblast, Russia
Black, nearly indistinguishable allanite-(La) grains, 1 to 3 mm, in brownish bastnäsite-(La), microprobed confirmed. The allanite-(La) is most clearly observed inside of the green oval(added to image via Photoshop). The child image is the same, without the oval. Specimen courtesy of Excalibur Mineral Company. S412-033
© 2007, JGW, courtesy of Photographic Guide to Mineral Species