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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.

 

RM2073   Grossular (var. Hessonite) with chlorite

Bellecombe, Ch√Ętillon, Valle d'Aosta, Italy

A classic specimen from the Alpine valley of Aosta. Group of very defined crystals of grossular, with an exceptional brightness and very intense orange color. They show faces of the dodecahedron and the trapezohedron. They are accompanied by aggregates of olive green chlorite. A very bright and aesthetic piece.


Size: 8.5 x 7 x 3.5 cm.
Main crystal: 4 - 5 mm.

Col. A. Arguijo (L'Hospitalet de Llobregat).
 
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