Calmegsuch

Calmegsuch, also known as calmagite, is a rare mineral belonging to the sulfate class. It was first discovered in 1971 in the Calmagite mine in the Khibiny Massif, Kola Peninsula, Russia. The mineral is named after the mine where it was found. Calmegsuch is typically found in association with other minerals such as nepheline, aegirine, and sodalite.

The chemical formula of calmegsuch is Na4Ca2(SO4)3Cl2. It crystallizes in the monoclinic system and forms prismatic crystals. The mineral is usually colorless or white, but it can also be found in shades of yellow, brown, or gray due to impurities. Calmegsuch has a hardness of 3.5 on the Mohs scale and a specific gravity of approximately 2.9.

Calmegsuch is not commonly used in industry or jewelry due to its rarity and the fact that it is often found in small, poorly formed crystals. However, it is of interest to mineral collectors and researchers due to its unique chemical composition and the geological context in which it is found. The mineral's discovery has contributed to the understanding of the complex mineralogy of the Khibiny Massif.