acanthite
noun
acan·thite
əˈkanˌthīt,
ˈakənˌ-
plural -s
: a mineral Ag2S consisting of a silver sulfide like argentite but crystallizing in slender prisms (specific gravity 7.2–7.3)
Word History
Etymology
International Scientific Vocabulary acanth- + -ite; from the thornlike shape of its crystals; originally formed as German akanthit
First Known Use
1856, in the meaning defined above