A huge and very rich, museum-sized specimen of micro-crystallized yellow Tsumcorite (Type Locality) perched on small crystals of Quartz. Tsumcorite is a lead, zinc, iron arsenate and is named after the Tsumeb (Tsum) Corporation (Cor) Mine. The sparkly brownish-yellow Tsumcorite is one of the signature rare-mineral species for which the Tsumeb Mine is renowned and also the TYPE LOCALITY. The tiny Tsumcorites richly and aesthetically cover much of the matrix, and there are even a few Tennantite crystals nestled below the Tsumcorite. The Quartz is uncommon for Tsumeb, so this is not only a fine rarity, but also an outstanding combination rarity that because of its size is among the largest display examples of the species I know of. Ex. Willy Israel Collection to me in about 2005, originally.