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 United States of America is considered the most powerful nation in the world and a place so many people dream of visiting, at least once during their lifetime. The country is visited by millions of people from all over the world annually, but only a handful of cities stand out among the rest. Itâs in honor of those ranked as a cut above that we present to you the Top 10 Most Visited Cities in the United States by Foreign Travelers. What youâll notice is that the majority of the top 5 cities boast the added advantage of offering warm weather.