Wulfenite with mimetite and calcite, from the Mina Ojuela, Mapimi, Mexico. The wulfenite is the distinctive orangey crystal, the mimetite is the fine-grained greenish masses, and the calcite crystals are the clear, sparkly ones.
Thumbnail mineral: About 1.0" x 0.6" x 0.9" (25mm x 15mm x 22mm)