wohedite

Wohedite is a mineral, a hydrated sodium calcium iron magnesium silicate. Its chemical formula is NaCaFe23+Mg2Fe23+(Si6Al2)O22(OH)2. Wohedite is a member of the amphibole group of minerals. It is known for its distinctive deep blue to black coloration, often with a vitreous luster. The mineral typically forms in metamorphic rocks, particularly those that have undergone high-temperature and low-pressure alteration. It is also found in some alkaline igneous rocks. Wohedite is relatively rare and has been primarily discovered in specific geological locations, often associated with other silicate minerals. Its occurrence is often linked to conditions where iron is in the ferric (Fe3+) state. The crystal structure of wohedite is characterized by double chains of silica tetrahedra, a common feature of amphiboles. Analysis of wohedite has contributed to understanding the complex geological processes involved in its formation and the behavior of iron in mineral structures. It is not a commercially significant mineral and is primarily of interest to mineralogists and geologists.