Dims: 3.1" x 2.2" x 1.9" (7.9 x 5.6 x 4.8 cm)
Wt: 5.1 oz. (144.9 g)
Mapimi, Durango, Mexico
This small hand specmien consists of a thin but rather pervasive crust made up of scores of botryoidal Conichalcite nodules that partly covers a limonite and goethite host rock. These nodules are tiny, not exceeding 0.1" (3 mm) in diameter, but are generally in excellent condition, as only a few are visibly damaged. The crust is rather odd in the fact that its green color is exceptionally dark. Like many such specimens from this locality, the Conichalcite is mostly covered with a layer of colorless and transparent calcite that in some areas takes on a rhombohedral form. The calcite gives the normally dull Conichalcite a bright vitreous luster and a sparkle. The crust is to all intents and purposes opaque, and serves as the base for a few small Wulfenite blades, most of which are gathered in a small cluster (see the close-up image).