👉 Flajolet's mineral, also known as "flajolotite," is a type of quartz crystal that exhibits remarkable optical properties. It is often found in the sedimentary rocks of South America and has been studied for its unique optical effects. Flajolet's minerals are characterized by their high refractive index (n ≈ 2.16) compared to typical quartz crystals, which have n ≈ 3.0. This property allows them to concentrate light waves in the