
1) Mineral 2) Silver mineral 3) Valuable silver ore
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1) Ore
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In mineralogy, Argentite is cubic silver sulfide (Ag2S), which can only exist at temperatures above 173 °C, 177 °C or 179 °C. When it cools to ordinary temperatures it turns into its monoclinic polymorph, acanthite. Argentite belongs to the galena group. The name `argentite` sometimes also refers to pseudomorphs of argentite: specimens of aca.....
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http://en.wikipedia.org/wiki/Argentite

• (n.) Sulphide of silver; -- also called vitreous silver, or silver glance. It has a metallic luster, a lead-gray color, and is sectile like lead.
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(from the article `acanthite`) Argentite is the high-temperature form of acanthite. Like several other sulfides, selenides, and tellurides of silver and copper, argentite forms ...
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http://www.britannica.com/eb/a-z/a/98
Ar'gen·tite noun [ Latin
argentum silver.]
(Min.) Sulphide of silver; -- also called
vitreous silver , or
silver glance . It has a metallic luster, a lead-gray color, and is sectile like lead.
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http://www.encyclo.co.uk/webster/A/119

Argentite is an important primary silver ore. The name is from Latin meaning 'silver'. Occurs disseminated in galena and in the cementation zone of lead and zinc deposits. Associated with cerussite, chlorargyrite, native silver. It has the formulae Ag2S and a relative hardness of 3.
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Silver sulfide
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[
n] - a valuable silver ore consisting of silver sulfide (Ag2S)
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http://www.webdictionary.co.uk/definition.php?query=argentite
noun a valuable silver ore consisting of silver sulfide (Ag2S)
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https://www.encyclo.co.uk/local/20974

a dark lead-gray sectile mineral, silver sulfide, AgS, occurring in crystals and as formless aggregates: an important ore of silver.
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