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.
Singapore â The second most popular city in East Asia with visitors, Singapore is expected to see 11.88 million visitors in 2015. Experts point out that the city, together with Kuala Lumpur and Bangkok, lacks a diversified source of visitors -- its top five visitor feeder cities are all from the Asia-Pacific region. 6.