Amblygonite

Description

Amblygonite is a lithium-bearing fluorophosphate mineral characterized by the chemical formula (Li,Na)AlPO4(F,OH). Geologically, it is identified within granite pegmatites, greisens, and high-temperature tin veins, frequently appearing alongside spodumene, lepidolite, tourmaline, and apatite. Structurally, it forms a solid solution series with montebrasite, which represents the low-fluorine terminal member of the group. While its physical appearance often leads to confusion with feldspars like albite, it is distinguished through density analysis, cleavage patterns, and lithium-specific flame testing. Historically significant as a concentrated source of lithium, containing approximately 10% of the element, amblygonite serves as a vital mineralogical component in industrial lithium extraction.