Mineral: | Dumortierita
| Fórmula química: | Al6.5-7(BO3)(SiO4)3(O,OH)3 | Tamaño: | | Peso: | | Transparencia: | | Número de piezas: | | Origen: | Aldea de Ohngaing (Ohn Gaing; Ohn Kai), cerca de Mogok, Birmania (Myanmar) | This is so far the biggest dumortierite crystal I have seen, even though the crystal has been slightly rounded by fluviatile transparent it's the own this place typical prismatic shaped with doubly termination! One prism side has been polished for identification purpose. The crystal striation is still visible and in between you can spot remaining lustrous areas. This is a true rarity and not many crystals have been found at all!!
| 
