Dims: 4.2" x 4.0" x 2.0" (10.7 x 10.2 x 5.1 cm)
Wt: 1 lb., 0.6 oz. (471 g)
Sao Jose do Safira, Minas Gerais, Brazil
This hand specimen consists of part of a crust that is made up of the Cleavlandite variety of Albite. The Cleavlandite occurs as thin, bladed crystals that show a hexagonal outline. Though many of them show visible damage, most are in good condition and have well-defined edges and clean faces that show a pearly luster. They have a uniform white coloration that shows a very faint hint of blue and are translucent, though some of them show tiny patches of transparence along their edges. Among the Cleavlandite blades rest dozens of trigonal prismatic elbaite crystals. Many of these are damaged, and most appeasr to be missing their termanations. Their brownish-green color is so deep that only the thinnest crystals show any appreciable transparence, while the largest, thickest crystals are positively opaque. The smaller crystals show a bright, vitreous luster that dulls as their size increases, so that the largest crystals show a dull, almost waxy luster. There is no other material or host rock on the specimen.