Ferrissulfaatit

Ferrissulfaatit is a rare mineral species discovered in 1966 in Sweden. It was first identified in the waste rocks of a zinc mine near the village of Kolmila. The mineral is a hydrated ferric sulfate with a chemical composition of (Fe, Ca)2(SO4)3 · 4H2O. It is characterized by its pale yellow to orange color and orthorhombic crystal habit.

The structure of ferrissulfaatit consists of layers of sulfate groups with iron and calcium ions located between them. The mineral has a layered crystal structure, which is typical for many sulfates. Its physical properties include a density of 2.4 g/cm3, a hardness of 2-3 on the Mohs scale, and a vitreous luster.

Ferrissulfaatit is a relatively rare mineral, mainly found in zinc and iron deposits. It has been reported in several countries, including Sweden, Norway, and Russia. It is often associated with other minerals, such as pyrargyrite, calcite, and gypsum. The mineral has limited economic importance due to its rarity and limited distribution.

Research on ferrissulfaatit has been mainly focused on its crystal structure and chemical composition. The study of this mineral has contributed to our understanding of the conditions under which sulfates form in geological environments. Ferrissulfaatit is an interesting mineral for collectors and researchers due to its unique appearance and rarity, but it is not widely available due to its limited occurrence and lack of significant economic value.