Kromipinnoite

Kromipinnoite is a rare mineral discovered in 2017, named after its chemical composition, which includes potassium (K), chromium (Cr), iron (Fe), and nickel (Ni). It is classified as a member of the spinel group, which also includes minerals like magnetite and chromite. Kromipinnoite is typically found in contact metamorphic rocks, particularly in areas where igneous intrusions have altered surrounding sedimentary rocks.

The mineral exhibits a dark brown to black color, often with a metallic luster. Its crystal structure is cubic, and it typically forms small, octahedral crystals or granular masses. Kromipinnoite is notable for its unique chemical composition, which is distinct from other spinel-group minerals. It is often associated with other minerals such as magnetite, chromite, and various silicates.

Kromipinnoite's discovery has contributed to the understanding of mineral formation processes in contact metamorphic environments. Its rarity and distinctive properties make it of interest to mineralogists and geologists studying the complex interactions between different rock types and the elements they contain. Despite its scientific significance, kromipinnoite remains relatively unknown to the general public due to its limited occurrence and the specialized knowledge required to identify and study it.