Aqua-regia is a mix made up of nitric acid and hydrochloric acid. It is also known as King's water or royal water, because of its capability of dissolving gold and platinum. It is made by mixing the two acids in a 1:3 ratio. It is used in gold refining operation and for etching purposes.
The mineral argentite has a chemical formula of Ag2S and is another name for silver sulfide. The metal silver is obtained from this mineral. In fact, the name of mineral is based on the Latin name of silver (Argentum). It consists of about 87% silver. Interestingly this ore is stable only at high temperature (around 179 degrees Celsius). It is a heavy mineral and has a specific gravity of about 7 gm/ml.
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