Malachite

 Malachite is an extremely popular, copper-based mineral! Malachite almost never forms individual crystals but instead is found as large botryoidal masses or stalactites, which, when cut up and polished, reveal beautiful concentric rings and other shapes! It's often found alongside chrysocolla, a beautiful teal mineral that is chemically similar to malachite. Malachite is highly sought after and has been used for decorative/ornamental purposes for centuries; it is also a form of low-purity copper ore that was refined during the Copper Age by cultures all over the planet, being turned into pure copper. Malachite is known on TikTok for being EXTREMELY toxic, while it is true that eating rock dust is never good for you; touching polished malachite is perfectly safe. (Don't believe everything on the internet.)