Wulfenite is a lead molybdate, secondary mineral typically found as thin tabular crystals with a bright orange-red, yellow-orange, yellow or yellowish grey color in the oxidized zones of hydro-thermal lead deposits.
It was named in honor of Austrian mineralogist Franz Xavier von Wulfen (1728, Belgrade, Serbia - 1805, Klagenfurt, Austria), forms in vibrant color unlike most minerals. 
 
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* Photos show all sides.
* Sizes, shapes and colors my vary due to being a natural stone, being hand-carved and/or difference in computer monitors.