Calcite - Masua, Iglesias, Sardinia, Italy
 
 A 6.9 cm long scalenohedron twin with partly good transparency and all around good luster on matrix with other calcites of best quality. Some of the smaller crystals, up to 2.7 cm in length, have dark phantoms. The Masua Mine, Iglesias in Sardinia is located directly by the sea surrounded by breathtaking scenery.