A very rich group of sharp metatorbernite crystals showing tetragonal forms, an intense green color and good luster. Shown in isolated crystals, but also as polysynthetic and echeloned growth. In some crystals we can observe a yellowish tones in the core which corresponds to metaautunite (fluorescent under UV light). A French mineralogy classic not seen since late 70's.

These specimens come from a mineralized vug found in 2009 from were were obtained several floating specimens and some with stalactitic shape. The walls of the fissure were covered by smoky quartz crystals. When samples are mined and pull out of the mine, a partially dehydratation occurs (from 12 to 8 H2O molecules) and torbernite become metatorbernite species. Margabal specimens can be classified as metatorbernite.