from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral form of silver sulfide, Ag2S, that is a major ore of silver, that forms slender prisms.
from The Century Dictionary and Cyclopedia
- n. A mineral, a sulphid of silver having the same composition as argentite, but differing in crystalline form: found at Freiberg, Saxony.
Named in 1855, from the Greek ἄκανθα (akantha) "thorn", because of the crystal shapes. (Wiktionary)