Dims: 2.1" x 1.6" x 1.5" (5.3 x 4.1 x 3.8 cm)
Wt: 3.58 oz. (101.6 g)
Mapimi, Durango, Mexico
This specimen contains some of the largest Adamite crystals that I have seen. I count less than 12 crystals on the limonite host rock, and a few of these are broken. However, the largest intact crystal measures 0.4 x 0.3 x 0.3" (1.0 x 0.8 x 0.7 cm) and is in excellent condition, with no damage and smooth, well-defined faces and edges. All of the crystals have the standard orthorombic prismatic form with diamond-shaped cross-sections and shallow, wedge-like terminations, and green-yellow color and adamantine luster. They are nearly transparent, but many internal fractures and inclusions destroy any chance of clarity. The limonite base has some visible layering in it, showing that there is probably still some intact goethite in the host rock. The Adamite crystals on this specimen are quite easy to see.