Amblygonite, Quartz

This specimen features a mix of clear quartz on matrix, hosting amblygonite—a mineral often misidentified for many years. Historically, amblygonite was frequently mislabeled due to its similarity to montebrasite. Both minerals are isostructural lithium aluminum phosphates, but they differ chemically: amblygonite contains a fluoride ion, while montebrasite contains a hydroxide ion. Given the similarity in charge and size between fluoride and hydroxide ions, it's easy to understand why montebrasite was often mistaken for amblygonite.

This specimen, however, represents a true amblygonite, making it a rare and wonderful display piece.