Dumortierite in Quartz 3

 

This specimen of dumortierite in quartz originates from Brazil and is a remarkable example. The bottom of the crystal is coated with pale blue dumortierite crystals. Weighing 22.4g and 2" long. Dumortierite is a very rare aluminum borate silicate mineral that appears in masses, small prismatic crystals, or fibrous inclusions within Quartz.