Large, relatively clear Brazilian rock crystal sphere with luminous inclusions

A large rock crystal sphere from Brazil, with luminous internal inclusions. 21 cm in diameter, a collector's size for showcase display.

Rock crystal is the purest variety of quartz (SiO₂). The inclusions classified as luminescent inclusions are microstructures that appear as bright points or streaks when light passes through them, often fluid inclusions or growth discontinuities.

Brazilian deposits in Minas Gerais are globally the most productive source of clear quartz spheres of collector's size. From a flawless rough block, the entire shape must be created without microfractures, which requires workshop precision.

The internal inclusions tell the growth story of the crystal: each micro-discontinuity marks a crystallization phase, each fluid inclusion a brief change in solution.

A collector's item with educational internal stratigraphy.