viridite

from The Century Dictionary.

• noun In lithology, the name given by Vogelsang to certain minute greenish-colored scaly, filamentary, or granular bodies frequently seen in microscopic sections of more or less altered rocks, especially such as contain hornblende, augite, and olivin.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Min.) A greenish chloritic mineral common in certain igneous rocks, as diabase, as a result of alternation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mineralogy A greenish chloritic mineral common in certain igneous rocks.