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 Most Popular Cities In The World To Visit. The contest between cities is highly contentious, as London, Paris and, in recent years, Bangkok all vie for the top spot among tourists. Millions flock to the sights and sounds of Bangkok every year, allowing it to score the top place on 2016's most visited cities.