These cassiterite crystals are from Divino das Lanranjeiras, Minas Gerais, Brazil. This area contains dozens of mines and prospects that work the pegmatites for the recovery of gemstones and minerals specimens. There are 85 known minerals found in the pegmatites and cassiterite although uncommon is sometimes found there. It is a tin oxide that contains the elements Sn and O. This piece consists of an albite feldspar crystal matrix that hosts several crystals and clusters of crystals on all sides of the piece. Most of the crystals exhibit twinned and complex growth. It is a small miniature that measures 1 1/2 x 1 3/8 x 7/8 inches or 38 x 35 x 22 mm..