But instead of the greenish glow of the aurora borealis, he saw red — flames and smoke from a volcanic eruption that Iceland had been uneasily awaiting.

Source: https://www.nytimes.com/2023/12/19/world/europe/iceland-volcano-eruption-lava.html

In May 2020, some unusual rocks containing distinctive greenish crystals were found in the Erg Chech sand sea, a dune-filled region of the Sahara Desert in southern Algeria.

Source: https://www.rawstory.com/a-battlefield-for-ants-new-study-on-ant-warfare-shows-we-could-manipulate-their-fights/

It was a murky splash of greenish water overlooked by a lot of flats.

Source: https://www.theguardian.com/travel/2023/jun/17/my-favourite-place-in-europe-17-travel-writers-on-the-country-that-feels-like-home

Some fruits and salads can turn brown or greenish in colour due to the oxidation effects when in contact with these metals.

Source: https://indianexpress.com/article/lifestyle/health/health-risks-associated-with-cooking-or-storing-food-in-copper-and-brass-cookware-8600179/

That is basically what causes the greenish ghostly lights in the sky, though they're not often seen in latitudes this far south.

Source: https://wibx950.com/ixp/705/p/northern-lights-new-york/

Unlike the ephemerals, cohosh doesn’t vanish, but it does appear less obvious as the foliage turns more greenish in summer.

Source: https://www.therecord.com/life/2023/04/23/in-the-garden-take-a-walk-on-the-wild-side.html

When it is the pure stuff, it will have a greenish cast to it and a bubble gum taste.

Source: https://www.salon.com/2023/06/03/from-bee-to-bottle-savannah-bee-company-founder-answers-your-buzziest-questions-about-honey/