Stokesite (rare matrix specimen) with Microlite

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 few groups of white colored Stokesite measuring up to 6 mm across sitting on unusually blue colored bladed Albite matrix forming an attractive overall specimen. Upon very close inspection, I spotted a couple golden colored Microlite crystals, but they are VERY small and you need decent magnification to see them. 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.