This is a KILLER thumbnail of cuproadamite on minimal matrix of limonite. The well formed glassy and translucent crystal measures 1.5 cm in length. What makes this specimen quite literally world class is the color of the crystal, a rich, lime or emerald green, combined with the stunning luster and translucency. I have seen previous pockets in collections, but never have I seen a crystal from Mapimi of this absolute quality before. Superb!