Jeremejevite

Jeremejevite is a rare borate mineral with the chemical formula Al3(BO3)(F,OH)3. It is known for its distinct hexagonal crystal structure and can occur in a variety of colors, most commonly light blue, but also yellow, colorless, and greenish. The mineral was first discovered in the Salanga River region of Siberia in the 1880s and was named in honor of Russian mineralogist Pavel Vladimirovich Jeremejev.

Occurrences of jeremejevite are scarce, with notable deposits found in Namibia, Russia, and Myanmar. In Namibia, it is often found associated with pegmatite intrusions. Gem-quality crystals are particularly sought after, and their rarity contributes to their high value. The hardness of jeremejevite on the Mohs scale is typically between 6.5 and 7.5, making it relatively durable.

The gemological properties of jeremejevite, including its vitreous luster and often striking blue hue, make it an attractive gemstone. Due to its rarity and limited supply, it is not widely available on the market and is primarily collected by mineral enthusiasts and gem collectors. Identification of jeremejevite often involves spectroscopic analysis and examination of its crystal habit.