from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A grayish-black mineral, essentially (CuFe)12Sb4S13, often containing other elements, and used as an ore of copper.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A complex ore of copper, a mixed sulfide of copper, iron, zinc, silver and antimony.
from the GNU version of the Collaborative International Dictionary of English
- n. A sulphide of antimony and copper, with small quantities of other metals. It is a very common ore of copper, and some varieties yield a considerable presentage of silver. Called also gray copper ore, fahlore, and panabase.
from The Century Dictionary and Cyclopedia
- n. A mineral often occurring in tetrahedral crystals (whence the name), also massive, of an iron-black color and brilliant metallic luster.
German Tetraëdrit, from Greek tetraedros, four-faced (from its four-faced crystals); see tetrahedron.(American Heritage® Dictionary of the English Language, Fourth Edition)
Named for its tetrahedral crystals in 1845. (Wiktionary)