Century Dictionary and Cyclopedia
- n. A native sulphid of arsenic and silver, occurring in rhombohedral and scalenohedral crystals and also massive. It has a beautiful cochineal-red color, and is hence called
ruby silver, or light-red silver ore; the latter name is given to distinguish it from the other form of ruby silver, pyrargyrite, which is dark-red or neatly black, and is called dark-red silver ore. Magnificent specimens of proustite are obtained from the mines of Chanarcillo in Chili.
GNU Webster's 1913
- n. (Min.) A sulphide of arsenic and silver of a beautiful cochineal-red color, occurring in rhombohedral crystals, and also massive; ruby silver.
- Named after French chemist Joseph L. Proust (1754-1826) in 1832. (Wiktionary)
“There are various other silver minerals including: [[cerargirite]] (AgCl), [[proustite]] (3Ag2S. Ag2S.), [[pirargirite]] (3Ag2S. Sb2S3),”
“ruby silver," stephanite or "black silver," and polybasite; the silver-arsenic sulphides, proustite or "light ruby silver" and pearcite; and the silver antimonide, dyscrasite.”
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Silvery words. (Mithril doesn't count.)
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