RUTILE
Specimen rut-16
$ 28.00Dims: 0.7 x 0.3 x 0.2" (1.8 x 0.8 x 0.5 cm)
Wt: 9.2 g w/ specimen box
Diamantina, Minas Gerais, Brazil
Though this thumbnail specimen is described as a "Rutile Twin", I personally think that it consists of two partly intergrown crystals. One of these crystals is broken and incomplete, but the other is in excellent condition, showing no damage, and measures nearly 0.6" (1.5 cm). It has the best tetragonal prismatic form that I have seen in any Rutile specimen, with well-defined edges and striated but clean faces. It has a good diamond-shaped cross-section and a shallow 4-sided domed termination. Both have a red-brown color that is so deep as to render them nearly opaque and an adamantine luster. A few shallow internal fractures betray their color. There is no host rock present, and the piece is affixed inside a plastic specimen box with a tacky wax.