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RM2221   Alurgite, Variety of Muscovite-2M1

Prabornaz mine, Saint-Marcel, Valle d'Aosta, Italy

Alurgite is a variety of purple muscovite. It was classified 1959 as an intermediate variety between leucophyllite and muscovite. A study of Knurr and Bailey (1986, online) showed that the alurgite, treated as muscovite-2M1 with Mn, contains trivalent manganese (in contrast to divalent Mn-containing "manganophyllite"). This specimen of good size shows us an aggregate of micaceous crystals, with an intense brilliance and good color, in a quartzite rocky matrix. A rare variety of muscovite.


Size: 10 x 8.5 x 6 cm.

 
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