Large interesting rock crystal sphere from Brazil with thread-like inclusions

A large rock crystal sphere from Zambia, with thread-like inclusion structures inside. 23 cm in diameter, a museum-quality collector's size.

Rock crystal is the purest variety of quartz (SiO₂). The thread-like inclusions can be rutile needles, goethite strands, or fine growth streaks. Precise identification requires microscopic examination; the simultaneity of growth is mineralogically significant.

Zambian deposits from the Karoo Basin yield rock crystal of this clarity. Pegmatite veins in the region are among the world's most productive for clear quartz material.

The entire spherical shape must be formed from a raw block with defined inclusions without micro-fractures. 23 cm demands workshop precision at every polishing stage.

A collector's item with instructive internal stratigraphy and museum size.