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.
Delhi and Mumbai are the most popular destinations, with each seeing over 4.5 million visitors in 2014. Additionally, the introduction of a new visa-on-arrival process for 46 countries, including the US, Germany and Australia, has helped encourage visitors to India. Vietnam saw three of its cities in the top 100 for the first time: Ho Chi Minh City, Hanoi and Halong.