blue !!! glowing rock crystal sphere with a plane in the crystal where the light refracts blue

A rock crystal sphere from Brazil. Inside, there is a refractive plane where light is reflected in a blue shimmer. This phenomenon is caused by a subtle growth discontinuity that acts as an optical interface within the crystal.

Rock crystal is the purest variety of quartz. The blue refraction of light is classified as iris quartz. Incident light is refracted and broken down into its spectral components at internal microstructures; a specific wavelength dominates depending on the geometry.

In this sphere, the geometry is oriented such that blue light is dominantly refracted. The phenomenon is dependent on the viewing angle. As the sphere is rotated, the blueness shifts.

A museum-quality collector's size. Brazilian deposits supply rock crystal material of this clarity from the pegmatite veins of Minas Gerais.

A collector's item with gemologically exceptional refractive optics and museum-level dimensions.