Stokesite (rare matrix specimen)

Item Description

A very rare specimen of the caclium tin silicate, Stokesite from the famous Urucum Mine in Brazi. This locality is known for producing the finest crystals / specimens of Stokesite extant, though they are rarely found on matrix. This piece features a groups of tan colored Stokesite measuring 9 mm across sitting on rarely seen bladed Albite matrix forming an attractive overall specimen. Upon close inspection, it appears there are some tiny golden crystals of Microlite on the piece as well. This species has been known since 1899, but samples are nearly impossible to obtain from any locality. Sometimes you can find them from Brazilian dealers, but that's about it. Interestingly enough, this species is actually named after a mathematician, who is the namesake for Stokes's law, describing the force acting on a particle moving in a fluid medium. From the collection of Rolando Gioia (a contributor to new definitive book on Brazilian minerals: "Minerais e Pedras Preciosas do Brasil").