from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A dark form of sphalerite that is rich in iron
from the GNU version of the Collaborative International Dictionary of English
- n. A ferruginous variety of shalerite or zinc blende, nearly black in color.
from The Century Dictionary and Cyclopedia
- n. A variety of sphalerite or zinc sulphid, containing considerable iron, and hence of a black color. The original, found at Marmato, near Popayan, in Colombia, contained 23 per cent. of sulphate of iron.
Sorry, no etymologies found.