from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A monoclinic mineral containing aluminum, chromium, hydrogen, iron, magnesium, nickel, oxygen, and sulfur.
from The Century Dictionary and Cyclopedia
- n. A hydrous chromium sulphate, occurring in fibrous masses having a pale-purple color. It is found at the Redington mine, Knoxville district, California.