Covellite
Image: <a href="//commons.wikimedia.org/wiki/User:Islam90" title="User:Islam90">Islam90</a> (CC BY-SA 4.0)
Description
The image displays a microscopic view of a polished section, showing a matrix of bluish-grey covellite with scattered, brighter, and more reflective grains of pyrite. The covellite exhibits its characteristic indigo-blue color under normal light, while pyrite appears as pale brass-yellow to whitish metallic specks.
Geological Context
Covellite is typically a secondary copper sulfide formed in supergene enrichment zones of copper deposits, often replacing primary sulfides like pyrite or chalcopyrite. Pyrite, a common iron sulfide, is frequently found as a primary mineral in such deposits, and its presence here suggests a paragenetic relationship where covellite may have formed at its expense or co-existed.
