rhodizite

Rhodizite is a rare, complex borate mineral with the chemical formula KAl4Be4B10O22(OH)2. It is characterized by its unusual crystal structure and composition, containing potassium, aluminum, beryllium, and boron. Rhodizite typically occurs as small, prismatic crystals, often found in pegmatite deposits. Its color can range from pale yellow to brownish-red, and it may exhibit fluorescence under ultraviolet light.

The mineral was first described in 1870 from material found in the Ilmen Mountains of Russia. Since its discovery, rhodizite has been identified in various locations worldwide, including Madagascar, Norway, and the United States, although occurrences are generally limited. Its rarity and the presence of beryllium make it a mineral of scientific interest, particularly for crystallographers and mineralogists studying complex borate structures. While not commercially significant, rhodizite is sometimes faceted for collectors due to its distinctiveness. The presence of beryllium necessitates careful handling due to its toxicity.