Nelgid

Nelgid is a rare and unique mineral that was first discovered in the late 19th century in the Kola Peninsula of Russia. It is named after its discoverer, the Russian mineralogist and geologist, Nikolay Evgenievich Golubev. Nelgid is a complex oxide mineral with the chemical formula Na2Ca2Fe2+2Fe3+4(Si2O7)2O2. It is typically found in granitic pegmatites and is associated with other rare minerals such as beryl and tourmaline.

Nelgid is known for its distinctive deep red to brown color, which is due to the presence of iron in its chemical structure. It has a hardness of 6 on the Mohs scale and a specific gravity of approximately 3.6. Nelgid is not commonly found in large quantities and is therefore considered a collector's item among mineral enthusiasts.

The mineral's crystal structure is complex, with a trigonal system and a space group of P31c. It is often found in small, prismatic crystals or in massive form. Nelgid is not known to have any significant industrial applications, but it is valued for its rarity and aesthetic appeal in the field of mineralogy.

In summary, nelgid is a rare and distinctive mineral with a unique chemical composition and crystal structure. Its discovery and study have contributed to the understanding of complex oxide minerals and have made it a sought-after item in the world of mineral collecting.