Sumutite

Sumutite is a rare mineral belonging to the silicate group, specifically a member of the pyroxene family. Its chemical formula is generally described as (Na,Ca)2(Mg,Fe2+)5Si8O22(OH)2. The name "sumutite" is derived from its type locality, Mount Sumute in Japan. It typically appears as prismatic crystals, often found in dense aggregates. The color of sumutite can range from dark green to black, with a vitreous luster. It is known to form under metamorphic conditions, commonly found in metamorphosed mafic and ultramafic rocks. The mineral is characterized by its distinctive optical properties, including a moderate birefringence and pleochroism. Sumutite is relatively scarce and is not of significant economic importance. Its occurrence is primarily of interest to mineralogists and geologists for understanding metamorphic processes and mineral paragenesis in specific geological settings. Further research continues to refine its precise crystallographic and chemical characteristics.