In this specimen we can see several ferberite crystals of very good size, with an excellent brilliance and a very deep black colour. Some of these crystals are even doubly terminated. They have grown on a matrix formed by hyaline quartz crystals and accompanied by small calcite crystals, siderite and brilliant arsenopyrite. The main crystal is: 3,4 x 2,3 x 1,0 cm. 1,33 x 0,90 x 0,35 inc.

ORIGIN: PANASQUEIRA MINES, SÃO FRANCISCO DE ASSIS VILLAGE, COVILHÃ, WHITE CASTLE, DA BEIRA CAVE, PORTUGAL

DIMENSIONS: 5.6x4.8x5.5