Stokesite, Albite (Var: Cleavelandite)
Urucum mine (Tim mine; Corrego do Urucum pegmatite), Galileia, Doce valley, Minas Gerais, Brazil
Toenail, 3.1 x 2.5 x 2.4 cm
Stokesite is a very rare calcium, tin silicate. A gorgeous little 1.0 cm radial spray of glassy stokesite crystals is beautifully perched atop a cluster of pearlescent, parallel-growth cleavelandite blades. This excellent specimen is from the Corrego do Urucum pegmatite of Brazil and is a very uncommon, gemmy spray of the species. Most Urucum stokesites are spherical, radial aggregates. Older material, from Carlos Barbosa, back in the late 1990s.