Opal-A (Var: Opal-AN), Quartz, Albite
Nonnewaug River Industrial Park, Woodbury, Litchfield County, Connecticut, USA
An encrustation of opal-AN in a fracture in vein quartz with some white albite in amphibolite. Some of the opal has a cyan color where it is not stained brownish-gray, perhaps caused by incorporated malachite from the alteration of chalcopyrite grains, some are on the reverse side.
© 2021 Harold Moritz