GeoPicture of the week: a magnificent tourmaline slice
Visually, tourmaline is one of the most spectacular minerals - it can appear in a myriad of colors and gradients, ...
Tag: tourmaline
GeoPicture of the week: Elbaite, cleavelandite, and quartz mined from California’s Tourmaline Queen Mine
Elbaite is a type of tourmaline, a sodium, lithium, aluminium boro-silicate. Cleavelandite is a type of albite feldspar.