ferroeerisiin

Ferroeerisite is a rare earth mineral with a chemical composition of Fe2+3+3(TiO4)(SiO4). It is a member of the tillite family of minerals and is known for its complex crystal structure.

Ferroeerisite was first discovered in 1957 in the Narva graben quartz gallery, Estonia and was named after the location. The mineral has since been found in other locations, including the Khingan Mountains in Russia and the Alto Rio Grande region in Argentina.

Ferroeerisite has a distinctive emerald green color due to its titanium and silicon content. It has a monoclinic crystal system and a variable habit, which can occur in tabular, columnar or fibrous forms. The mineral has a relatively low density of 4.3-4.4 g/cm3 and a distinctive fluorescence under ultraviolet light.

Ferroeerisite is a relatively rare mineral and is not well-known among collectors or mineralogists. It is typically found in association with other minerals, such as quartz, feldspar and amphibole. The mineral has been subjected to various analytical techniques, including X-ray diffraction and atomic absorption spectroscopy.

While ferroeerisite has been studied for its mineralogical properties, it has no known economic significance or industrial applications. Its rarity and limited distribution contribute to its interest for mineralogists and collectors looking to study unique and exotic mineral species.