Glossary [7]
effusive volcanic rock: effusive volcanic rocks have a vitreous structure, are magmatic rocks which form on the earth's surface due to a fusion of rocks of the mantle and earth's crust. The porphyry, used in covering floors, is an effusive volcanic rock.
emery pulp: this mineral is a variety of corundum, of grey, dark grey colour, due to the presence of spinel, magnetite and haematite. It is used in pulp as abrasive during marble polishing.
enamalled ceramics: ceramics whose surface is covered by a glass covering called enamel with the function of protecting it from external agents or for decorative purposes.
enamel: vitreous covering applied to the surfaces of some goods in ceramics or in stone like granite with the function of protecting and/or decorating.
external furnishing: the art of being able to lay out the components, objects and coverings of an external environment.
