Lahtistite

Lahtistite is a rare mineral composed of magnesium, manganese, and iron. Its chemical formula is generally represented as (Mg,Mn,Fe)3(PO4)2. The mineral was first discovered in the Lahtisjärvi pegmatite deposit in South Karelia, Finland, which is where its name originates. Lahtistite typically forms in granitic pegmatites, often associated with other phosphate minerals. It can also be found in some metamorphic rocks. The color of lahtistite can vary, commonly appearing as light brown, yellowish, or grayish crystals. Its crystal system is monoclinic. Lahtistite is a relatively soft mineral, with a Mohs hardness typically around 4.5 to 5. It is not a commercially significant mineral and is primarily of interest to mineral collectors and researchers due to its rarity and specific geological occurrence.