This piece shows yellow colored sphere-shaped wavellite aggregates, disposed very aerial on a matrix covered by prismatic brilliant quartz crystals. Wavellite aggregates show a good luster and some transparence. The quality of these wavellite specimens from Siglo XX mine is really good, especially when compared to finds from last years at this Bolivian mine. The main crystal is: 2 x 1,3 x 0,9 cm. Fluorescence UVC & UVA.