BERTRANDITE
Specimen brr-1

Dims:0.8x0.7x0.3" (2.0x1.8x0.3 cm)

Wt: 0.2oz. (6g)w/base

Galconda Mine, Govenador Valadares, Minas Gerais, Brazil

This specimen consists of hundreds of tiny intergrown orthorhombic prisms of bertrandite. There is no matrix material with this specimen. Some of the bertrandite crystals are transparent, showing striations and vitreous luster. Near the base of this specimen is one crystal of bertrandite showing a hexagonal shape. I believe that this is a pseudomorph of bertrandite after beryl.

Dims:1.4x0.7x0.7" (3.6x1.8x1.8 cm)

Wt: 0.2oz. (7g)

Governador Valadares, Minas Gerais, Brazil

This thumbnail specimen consists of hundreds of tiny intergrown crystals of bertrandite, with no matrix at all. Close examination with a loupe reveals that many of these crystals are hexagonal in shape, leading me to believe that these are in fact pseudomorphs after beryl. Scattered sparsely over the specimen are tiny crystals of pyrite and/or chalcopyrite. There is only the most minor damage to this specimen.