A REALLY NIFTY and UNUSUAL, two-sided Tsumeb specimen from the Rob Smith Collection. Sparkly, colorless to tan Smithsonite microcrystals totally coated and partially replaced aragonite (variety tarnowitzite) crystals on both sides of this very showy specimen. The thin matrix plate in the middle is a very nice contrast to this unique, two-sided specimen. The crystals reach 2.7 cm on this excellent piece. Tarnowitzite is the lead-rich aragonite varietal and is moderately rare at Tsumeb.This style of pseudomorph was found only once, in the mid 1980s.