[Krystyna]

   
Herderite
Locality: Barra de Salinas district, Barra de Salinas, Coronel Murta, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org)
Size: miniature, 3.4 x 2.2 x 1.7 cm
Hydroxyl-Herderite
This fine specimen is a floater with no damage. The well-formed, main crystal of hydroxylherderite is doubly terminated, lustrous, translucent, lilac- colored, 3.4 cm in length, and is associated with a smaller hydroxylherderite along with minor, yellow muscovite to give it a bit of depth.
https://commons.wikimedia.org/wiki/File:...07-51a.jpg