scaglia (skalya)

[It., a scale, a chip of stone, etc.: see scale1.] The local name in parts of the Italian Alps of a limestone of various colors, and of different geological ages. The typical scaglia is a reddish argillaceous limestone with a decidedly conchoidal fracture. This rock is of Jura ic age; but there is an upper scaglia which is of the age of the Upper Cretaceous. scagliola (skal-yoʻlä), n. [Also scaliola; employed must be as pure and white as po ible. Various colors are given to it by a mixture of metallic oxids. Te scagliola imitate different kinds of marble, the colors are mixed with the paste. Breccias are imitated by introducing fragments of colored stucco; granites and porphyries in the same way, and also by cutting into the stucco and filling the cavities with a paste having the color of the crystals it is desired to imitate. Sometimes the stucco is put upon the wall with a brush, as many as twenty coats being applied. It is then roughly polished, and the cavities and defective places filled up; and this is done over ection has attained the desired per a finer polish is IMG:content-0202.png:[blocks in formation]