Discover Dumortierite crystals and Quartz pieces coloured by blue to violet Dumortierite inclusions. This aluminium borosilicate is admired for rich colour and is often found as fibrous material within Quartz rather than as large individual crystals. Traditionally associated with discipline, mental focus and insight, Dumortierite is a useful addition to study spaces and blue mineral collections. Patterns and colour depth vary naturally between pieces.