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Answer for the clue "A valuable silver ore consisting of silver sulfide (Ag2S) ", 9 letters:
argentite

Alternative clues for the word argentite

Word definitions for argentite in dictionaries

Wikipedia Word definitions in Wikipedia
In mineralogy , argentite (from the Latin argentum , silver) is cubic silver sulfide (AgS), 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 . ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Argentite \Ar"gen*tite\, n. [L. 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.

WordNet Word definitions in WordNet
n. a valuable silver ore consisting of silver sulfide (Ag2S)

Wiktionary Word definitions in Wiktionary
n. (context mineral English) silver sulphide, (Ag 2 S), a primary ore of silver, in cubic or hexoctahedral crystals.

Usage examples of argentite.

What we have here is about forty tons of argentite with a very high silver content.