A compact thumbnail specimen of dumortierite, showcasing its characteristic deep blue coloration. The specimen is mostly massive, with a microcrystalline habit, and is stable for display or inclusion in a mineral collection. Dumortierite often occurs in aluminum-rich metamorphic rocks, and this piece exemplifies the mineral’s intense color and typical associations.
Mineral: Dumortierite (Al₇BO₃(SiO₄)₃O₃)
Color: Deep blue, opaque
Habit: Massive to microcrystalline
Size: 16 mm x 12 mm x 7.5 mm
Crystal System: Orthorhombic
Locality: Arizona, USA
Notes: Representative of aluminum-rich metamorphic environments; excellent example of dumortierite’s intense coloration
