Dims:5.3x4.0x2.6" (13.5x10.1x6.6 cm)
Wt: 31.0oz. (879g)
Ouro Fino Mine, Coronel Murta, Minas Gerais, Brazil
This is a large cluster of muscovite mica crystals with a small amount of albite scattered about the piece. This specimen is most unusual-when I first glanced at it, I thought that the muscovite crystals had an alteration rind covering them. Upon examination, however, what appeared to be an alteration rind is actually a secondary growth of muscovite crystals, these being much smaller. This effect can be observed on the bottom of the specimen, and on one of the top faces. The largest crystal on this specimen measures 3.3" (8.4cm) in length. There is no damage to this specimen per se, breaks on the bottom and one of the top faces serve to show the unusual secondary growth.