Wulfenite    Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia.  Ex. Caroline Les collection.  An attractive, lustrous, zoned crystal sits high, amongst others, on this piece.  It measures 5.7 x 5.5 x 2.9 cm.  There some rubs and chips as can be seen in the photos, thus the low price.  $50