1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone mineral 5) Gemstone 6) Jewel 7) Jewel mineral 8) Mineral jewel 9) Mineral gemstone 10) Polished mineral 11) Polished jewel 12) Prized mineral 13) Precious jewel 14) Prized stone 15) Precious gemstone 16) Precious stone 17) Precious gem
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https://www.crosswordclues.com/clue/proustite
1) Ore 2) Ruby silver
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https://www.crosswordclues.com/clue/proustite
Proustite is a sulfosalt mineral consisting of; silver sulfarsenide, Ag3AsS3, known also as light red silver or ruby silver ore, and an important source of the metal. It is closely allied to the corresponding sulfantimonide, pyrargyrite, from which it was distinguished by the chemical analyses of Joseph L. Proust (1754-1826) in 1804, after whom th...
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http://en.wikipedia.org/wiki/Proustite
• (n.) A sulphide of arsenic and silver of a beautiful cochineal-red color, occurring in rhombohedral crystals, and also massive; ruby silver.
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http://thinkexist.com/dictionary/meaning/proustite/
a sulfosalt mineral, silver arsenic sulfide (Ag3AsS3), that is an important source of silver. Sometimes called ruby silver because of its ...
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http://www.britannica.com/eb/a-z/p/124
Proust'ite noun [ From the French chemist, J. Latin
Proust .]
(Min.) A sulphide of arsenic and silver of a beautiful cochineal-red color, occurring in rhombohedral crystals, and also massive; ruby silver.
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http://www.encyclo.co.uk/webster/P/182
Proustite is an ore of silver with a characteristic ruby-red colour, vermilion streak and a brilliant lustre. It has the formulae Ag3AsS3 and a relative hardness of 3.
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http://www.probertencyclopaedia.com/browse/HP.HTM
Silver thioarsenite
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http://www.translationdirectory.com/glossaries/glossary075.htm
a mineral, silver arsenic sulfide, AgAsS, occurring in scarlet crystals and masses: a minor ore of silver; ruby silver.
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https://www.infoplease.com/dictionary/proustite
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