Ruutil

Ruutil is a rare mineral belonging to the spinel group, with the chemical formula (Mn2+,Mg)Al2O4. It is named after the Finnish mineralogist, Aarne Ruutil. Ruutil is typically found in metamorphosed manganese-rich rocks, often in association with other manganese minerals such as braunite and jacobsite. It is known for its distinctive deep red to brown color, which is due to the presence of manganese in its structure.

The mineral crystallizes in the cubic system and has a hardness of approximately 6.5 on the Mohs scale. Its specific gravity ranges from 4.1 to 4.3, indicating its relatively high density. Ruutil is often found as small, octahedral crystals or as granular masses. It exhibits a submetallic luster and has a conchoidal fracture, meaning it breaks with a smooth, curved surface.

Ruutil is not commonly used in industry due to its rarity and the presence of more abundant and economically viable manganese minerals. However, it is of interest to mineral collectors and researchers due to its unique chemical composition and physical properties. The study of ruutil contributes to the understanding of the geological processes involved in the formation and transformation of manganese-rich rocks.