from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A green variety of muscovite
from The Century Dictionary and Cyclopedia
- n. A variety of muscovite, or common mica, containing a small amount of chromium. It has a green color. Also called chrome-mica.
Sorry, no etymologies found.
"The quartzite shows granoblastic and blastopsammitic texture, with grain sizes varying from coarse sand to very fine pebble and with minor microcrystals of sericite, fuchsite, andalusite and iron oxide, besides detrital tourmaline, rutile, and zircon." link
Most aventurine is of reddish brown or yellow colour, but a green variety, containing scales of fuchsite or chrome-mica, is also known.
Sericite alteration is ubiquitous within the sheared rocks, and fuchsite and biotite have been observed locally.
Alteration is characterized by carbonates and fuchsite in ultramafic rocks and by hematite in dykes.
The quartzites locally contain fuchsite (chrome mica) where proximal to the mineralization.