tormiline

Tormiline is a rare and complex mineral that belongs to the group of nesosilicates. It was first discovered in 1983 in the Torma mine in Finland, from which it derives its name. The mineral is typically found in granitic pegmatites and is characterized by its dark brown to black color and its metallic luster. Tormiline has a hardness of 5.5 to 6 on the Mohs scale, making it relatively hard and durable.

The chemical composition of tormiline is (Fe,Mg)2(Fe,Mg)SiO4, which indicates that it contains iron, magnesium, and silicon as its primary constituents. The mineral's crystal structure is monoclinic, and it often forms prismatic crystals with a distinct cleavage. Due to its rarity and the specific conditions required for its formation, tormiline is not commonly used in industrial applications. However, it is of interest to mineralogists and collectors for its unique properties and aesthetic appeal.

Tormiline's rarity and the challenges associated with its extraction make it a valuable specimen for scientific study. Its presence in certain geological formations provides insights into the processes that occur during the crystallization of granitic pegmatites. Despite its limited practical use, tormiline remains an important subject of study in the field of mineralogy, contributing to our understanding of the Earth's crust and the formation of minerals.