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 smallest country in this part of the world is Saint Kitts and Nevis, it is only two small islands in the Caribbean. Among the most visited North American countries the number one is the USA, where New York City is considered the most attractive landmark for travellers, further followed by Mexico and Canada. Alphabetical list of countries in North America.