出典:Wiktionary
出典:『Wiktionary』 (2024/10/30 14:14 UTC 版)
Named in 1855, from Ancient Greek ἄκανθα (ákantha, “thorn”) + -ite, because of the crystal shapes.
acanthite (uncountable)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/02 21:08 UTC 版)
Acanthite, Ag2S, crystallizes in the monoclinic system and is the stable form of silver sulfide below 173 °C. Argentite is the stable form above that temperature. As argentite cools below that temperature its cubic form is distorted to the monoclinic form of acanthite. Below 173 °C acanthite forms directly. Acanthite is the only stable form in normal air temperature.