Eremkovy

Eremkovy, also known as eremkovite, is a rare mineral species that was first discovered in the Eremkovsky mine in the Khibiny massif, Kola Peninsula, Russia. It was named after the mine where it was found. Eremkovy is a complex oxide mineral with the chemical formula Na2Ca2Fe2+4Fe3+2O10. It crystallizes in the monoclinic crystal system and typically forms prismatic crystals or granular aggregates. The mineral is dark brown to black in color and has a metallic luster. Its hardness on the Mohs scale is approximately 5.5, and it has a specific gravity of about 4.3.

Eremkovy is a member of the eremkovy group, which includes other minerals with similar chemical compositions and structures. The group is named after eremkovy, and other minerals in the group include eremkovite-(Y) and eremkovite-(Ce). These minerals are of interest to mineralogists and geologists due to their unique chemical compositions and the geological conditions under which they form. Eremkovy is typically found in alkaline igneous rocks and pegmatites, often associated with other rare minerals such as loparite and aegirine.

The discovery of eremkovy and other minerals in the eremkovy group has contributed to the understanding of the complex mineralogy and geochemistry of alkaline igneous rocks. These rocks are of significant interest due to their economic value, as they often contain valuable minerals such as rare earth elements and niobium. The study of eremkovy and related minerals continues to be an active area of research in the fields of mineralogy and geology.