from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A massive mineral, greenish in colour and opal-like in appearance, essentially a hydrous silicate of iron.
from the GNU version of the Collaborative International Dictionary of English
- n. A massive mineral, greenish in color, and opal-like in appearance. It is essentially a hydrous silicate of iron.
from The Century Dictionary and Cyclopedia
- n. A hydrated silicate of iron, of a conchoidal fracture and earthy structure, and varying from yellow to green in color.
chloro- + opal (Wiktionary)