For silver the more important deposits commercially are such compounds as the minerals tetrahedrite and argentite (silver sulfide, Ag 2 S), which is usually associated with other sulfides such as those of lead and copper, as well as several other sulfides, some of which contain antimony as well.
France is the most visited European nation with 83.7 million international tourist arrivals in 2014. Established in the late 1700s, the Louvre Art Museum in Paris is one of the most frequented tourist sites in all of France. Europe is a fascinating continent, and it attracts millions of tourists annually.
The Giantâs Causeway Visitor Centre has remained the most visited attraction for the last six years. In 2007 the top ten ranked attractions remained similar to 2006. However 2007 saw seven of the top ten attractions experience an annual increase. A total of 712,714 visited the Giantâs Causeway Visitor Centre in 2007, up 29% on the previous year. Belfast Zoological Gardens ranked second, attracting 294,935 visitors in 2007, an increase of 14%.