Adular from Blinnen Valley, Reckingen, Goms, Valais, Switzerland. Comes with certificate of authenticity. Average weight (Carats): 145.5 carats. Dimensions (mm): 43 x 27 x 11 mm. Ref. : SKU050632. Adularia is a variety of orthoclase, silicate group, tectosilicate subgroup, feldspar family. Pale yellow in color with bluish reflections, it is present in plutonic and metamorphic rocks.