Tourmalated Quartz Point grey/black

A hand-polished Tourmalated Quartz point from Brazil with clear quartz and embedded black tourmaline crystals (schorl). The combination of both minerals in a single crystal is a geological peculiarity.

Tourmalated quartz is formed when schorl crystals (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) are completely enclosed by crystallizing SiO₂ during later quartz growth. The black needles remain permanently preserved in the clear quartz.

Such multiphase crystals form under special pegmatitic conditions, where quartz and tourmaline crystallize in parallel within the same solution system. Brazilian pegmatites are among the classic deposits for this material.

Each point varies in tourmaline distribution and shape. The high-contrast composition of clear quartz and black needles makes each piece a documented collector's item with a clear mineralogical statement.