hapnikumogulite
Hapnikumogulite is a rare mineral discovered in the late 20th century, named for its unique chemical composition and the location of its first discovery. It is a complex oxide mineral, with the chemical formula (K,Na)2Ca2(Fe,Mg)4Ti2Si8O28. The mineral is typically found in granite pegmatites, often associated with other rare minerals such as beryl and tourmaline. Hapnikumogulite crystals are usually small, ranging from a few millimeters to a few centimeters in size, and are typically dark brown to black in color. The mineral exhibits a submetallic luster and has a hardness of approximately 6 on the Mohs scale. Its crystal system is monoclinic, and it often forms prismatic crystals with a distinct pinacoidal termination. The mineral's name is derived from the Russian words "hapnik" meaning "happy" and "mogul" meaning "emperor," reflecting the joy of its discovery by mineralogists. Despite its rarity, hapnikumogulite is of interest to mineral collectors and researchers due to its unique composition and the geological conditions under which it forms.