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proustite

N แร่ เงิน และ สารหนูช นิดหนึ่ง 

 

Webster's 1913 Dictionary

PROUSTITE

Proust "ite, n. Etym: [From the French chemist, J. L. Proust. ] (Min. )

 

Defn: A sulphide of arsenic and silver of a beautiful cochineal-red color, occurring in rhombohedral crystals, and also massive; ruby silver.