- Brookite, Quartz
- Small Cabinet, 5.2 x 2.8 x 2.8 cm
- Diamantina, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
This specimen of quartz encloses a sharp brookite inclusion, a single elongated crystal with perpendicular "wings" of minute acicular brookite crystals flying off of it to the sides. You can see why the Brazilians call these "dragonflies" in quartz. Polished to highlight the inclusion, this is a remarkably clear crystal core, and with one of the larger such inclusions I have seen. Weighs 61 grams.