from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A trigonal-pyramidal mineral containing aluminum, arsenic, hydrogen, magnesium, manganese, and oxygen.
from The Century Dictionary and Cyclopedia
- n. A hydrous arseniate of manganese, aluminium, and magnesium, occurring in small rhombohedral crystals of a red color at Nordmark in Sweden. Also called diadelphite.