Stephanite is a silver antimony sulfosalt mineral with formula: Ag5SbS4 It is composed of 68.8% silver, and sometimes is of importance as an ore of this metal.{sfn|Spencer|1911|p=880} ==History== Under the name Schwarzerz it was mentioned by Georgius Agricola in 1546, and it has been variously known as `black silver ore` (German Schwarzgultigerz.....
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http://en.wikipedia.org/wiki/Stephanite
• (n.) A sulphide of antimony and silver of an iron-black color and metallic luster; called also black silver, and brittle silver ore.
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http://thinkexist.com/dictionary/meaning/stephanite/
a sulfosalt mineral, silver antimony sulfide (Ag5SbS4), that occurs as black, lustrous, orthorhombic crystals, fine particles, or masses in small ...
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http://www.britannica.com/eb/a-z/s/159
Steph'an·ite noun [ So named after the Archduke
Stephan , mining director of Austria.]
(Min.) A sulphide of antimony and silver of an iron-black color and metallic luster; called also
black silver , and
brittle silver ore .
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http://www.encyclo.co.uk/webster/S/193
Stephanite is a minor ore of silver. One of the last minerals to form in silver veins. It has the formulae Ag5SbS4 and a relative hardness of 3.
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http://www.probertencyclopaedia.com/browse/HS.HTM
a mineral, silver antimony sulfide, AgSbS: an ore of silver.
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https://www.infoplease.com/dictionary/stephanite
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