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RM320   Metatorbernite

Margabal, Entraygues-sur-Truyère, Aveyron, Midi-Pyrénées, France

A very rich and huge size group of sharp metatorbernite crystals showing tetragonal forms, an intense green color and good luster. They show a classic polysynthetic and echeloned growth and some vugs from its stalactitic origin on the back side. We can observe a yellowish fluorescence due to the presence of metautunite. This species is visible also as yellowish tones in the core of some exfoliated crystals. 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.


Size: 6,1 x 5,3 x 5,2 cm.
Main crystal: 1,0 x 0,9 cm.
Found in 12/2009

Fluorescent under long wave UV
 
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