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.
Germany is the seventh most visited country in the world, with a total of 407.26 million overnights during 2012. This number includes 68.83 million nights by foreign visitors, the majority of foreign tourists in 2009 coming from the Netherlands, the United Kingdom, and Switzerland. Additionally, more than 30% of Germans spend their holiday in their own country. According to Travel and Tourism Competitiveness Reports, Germany is rated as one of the safest travel destinations worldwide. The offici