Silver is named from the Anglo-Saxon siolfur, the symbol ag is from the Latin argentum. Silver has been known since ancient times, it is mentioned in the book of Genesis in the Bible. Silver occurs native and in ores such as argentite and horn silver; lead, lead-zinc, copper, gold and copper-nickel ores are principal sources. Mexico, Canada, Peru and the U.S. are the principal producers in the western hemisphere. Pure silver has a brilliant white metallic luster. It is a little harder than gold and is very ductile and malleable. Silver is used for many applications, some of which are photography, for making jewelry, electrical contacts, brazing alloys, solder and high-capacity storage batteries.