Figure 1. Muscovite mica, known from a single locality in Japan, can display trapiche structure with both open (left) and closed (right) centers. Photomicrographs by Nathan Renfro; field of view 4.05 ...

This massive Cr-muscovite, reportedly from southern Ethiopia, is better known in the trade as fuchsite. The longest rough piece measures 53 mm, and the faceted stone weighs 2.56 ct. The material was ...