Bayldonite is a rare mineral that can be found in small quantities around the world. Though not many synonyms exist for this mineral, it is sometimes referred to as 'plushkinite' due to its similar chemical composition. Other minerals with similar properties to bayldonite include rosiaite, caledonite, aurichalcite, and malachite. These minerals, like bayldonite, are typically found in the oxidized zones of certain copper and lead mines. They have a green-blue color and are soft and brittle in nature. While bayldonite may not have many synonyms, it remains an important mineral used in research and collecting.