Large, clear, interesting rock crystal sphere from Brazil with a great internal structure

A large, clear rock crystal sphere from Brazil, with a complex internal structure of growth discontinuities and fine inclusions. 25 cm in diameter, a museum-quality collector's size.

Rock crystal is the purest variety of quartz (SiO₂). The internal structures visible here are remnants of the crystal's growth history: growth fronts, micro-cavities, fluid inclusions – every detail documents a specific phase of crystallization.

Brazilian rock crystal deposits in Minas Gerais are the world's most productive source of clear quartz spheres of collector size. The entire spherical shape must be formed from a flawless rough block without micro-fractures.

The complexity of the internal structure is part of its gemological value. A crystal-clear, empty sphere seems sterile; a piece with a defined internal structure has character and a story to tell.

A collector's item of museum dimension with didactically valuable internal stratigraphy.